By Kevin Mo
It was a sunny day in August with a clear blue sky and white clouds drifting over the historic Southern Chinese city of Dali. Driving around Erhai Lake, we were amazed at vastness of the picturesque lake and the imposing Cangshan Mountain shrouded in clouds. Unfortunately, only a handful of tourists were visiting the lake that day, a sharp decline from the crowds it drew in previous years.
In the past, thousands of inns and restaurants were built around Erhai Lake to capitalize on its natural beauty. At the time, the sewage from these businesses was directly discharged into the lake. In addition, a large amount of chemical fertilizer and pesticide applied to the surrounding farmland flowed into the lake as runoff, seriously degrading the lake’s water quality. Large-scale blue-green algal blooms became regular occurrence. In April of this year, the Dali Municipal Government issued an announcement that regulated the tourism industry in the main commercial center of the Erhai Lake Basin in order to improve environmental conditions. All the inns and restaurants in the area were asked to suspend operations until passing an inspection by the local environmental protection authority. As a consequence, tourism near Erhai Lake—which should now be in its peak season—has been reduced to a trickle.
Erhai Lake’s Dilemma
Erhai Lake is faced with a long-term dilemma. As a lake on the Yunnan-Guizhou Plateau, Erhai is the second largest freshwater lake in Yunnan, with a surface area of about 256km2 and a maximum depth of 20m. Nearly 800,000 locals rely on the lake for their drinking water. The lake’s water quality is categorized between Grade II and Grade III, much better than the water quality of Yunnan’s Dianchi Lake, which is worse than Grade V. Nonetheless, all of the sewage from the hotels, restaurants and car washing stations within the Erhai Lake basin has long been directly or indirectly discharged into the lake, and no facilities for pollution control have been put in place by the many tourism service providers.
Moreover, there are large areas of farmland and a number of livestock and poultry farms along the major rivers that flow into Erhai Lake. These non-point pollutants (such as agricultural pesticides and chemical fertilizers) and livestock manure are highly concentrated. As a result, the water quality of many tributaries have become Grade IV or even Grade V before they flow into Erhai Lake. The long-term increase in pollution has rapidly increased the amount of nutrients in the water. Under certain circumstances, this may make it easier to trigger large-scale algal blooms in the lake. If no measures are taken to control this situation, Erhai Lake could easily become the next Dianchi Lake.
According to the website for the PPP (Public-Private Partnership) Center under China’s Ministry of Finance, since 2015 there have been seven large-scale PPP projects related to integrated environmental control in Erhai Lake. These projects are currently under construction or will begin construction soon. The total investment for these projects is nearly 13 billion RMB. These projects include sewage interception around the lake, integrated treatment of river channels flowing into the lake, sewage collection and treatment, ecological restoration and wetland building in the lakeside buffer zone, and contiguous regulation of the rural environment. Although the government payment cycle for some projects reaches up to 20 years, the local government has launched a few environmental protection and control projects in Erhai with a total investment of 13 billion RMB within two years, indicating the strong political support the Dali Prefectural Government is giving to improve the local environment. Such spending poses a large fiscal pressure on the local government, which had a fiscal revenue of only about 15 billion RMB in 2016.
Despite their huge investment in environmental protection projects, local officials are still deeply worried about non-point pollution in rural areas, and they have yet to find an appropriate solution to this challenge. While the PPP projects are mainly designed to improve Erhai Lake’s water quality, restore the wetlands, and better manage urban and rural domestic sewage, they fail to address the non-point pollution sources that have the most serious impacts on water quality in Erhai Lake: the excessive application of chemical fertilizers and pesticides in local rural areas. It is hard to say whether the 13 billion RMB investments in environmental protection and control projects can make the water quality of Erhai Lake reach meet the necessary standards without first reducing the application of pesticides and chemical fertilizers in the surrounding rural areas.
Many policy makers tend to hesitate when it comes to addressing the non-point pollution problem in rural areas. It is difficult to change the long-term farming practices of Chinese farmers permanently through the kinds of large-scale financial investment and engineering projects on which the government usually relies. Actually, this is a national problem. Over the past few years, trillions of RMB have already been invested in PPP projects related to environmental protection and control. However, few effective solutions have been found to address the non-point pollution problem in rural areas. Most of the existing PPP projects fail to address the root causes of the pollution. These projects typically include domestic wastewater treatment plants, pipeline installations, industrial wastewater collection and disposal, river channel dredging, wetland restoration, and water landscaping. However, if the non-point pollution problem in rural areas cannot be addressed, it is unclear to what extent these huge investments can help improve water quality and environment and how long the results are expected to last.
Ironically, some PPP project developers building wastewater treatment plants or laying pipelines are afraid that the wastewater disposal fees collected from local government as part of the PPP contract may decline sharply if the pollutant source is reduced. Without sufficient levels of sewage to treat, wastewater treatment plants could see a drop in their revenue.
Garlic planting: the source of pollution?
Statistics from 2016 show that Yunnan Province is the largest home to state-level “poverty counties” in China, with 73 counties falling under the classification. The counties surrounding Erhai Lake, such as Eryuan, Jianchuan, Yangbi, Heqing and Midu counties, are on the list. So are many surrounding traditional agricultural areas, which as designated by the state as permanent basic farmland zones. Therefore, alleviating poverty and helping local farmers make money has become the first priority of local officials.
It is worth mentioning that Eryuan County, a state-level poverty county located at the upper reaches of Erhai Lake, has become the only county in China growing single-clove garlic on a large scale due to its unique geographic location and climate. The single-clove garlic has both high nutritional and economic value. In recent years, the garlic has generated a net income of more than 10,000 yuan per mu for local farmers in Eryuan County. The transfer fee of farmlands used for growing garlic has risen to 5,000-6,000 yuan per mu, much higher than that of farmland for other crops. Eryuan County is expected to become the first state-level poverty county in Yunnan Province to have officially alleviated poverty by 2017.
To increase the production of garlic, however, local garlic growers use large amounts of chemical fertilizers and water. The amount of chemical fertilizers applied has reached nearly 200kg per mu. The high nitrogen and phosphorus content in chemical fertilizers has become the major contributors to eutrophication in Erhai Lake. Moreover, the pesticides with a high content of toxic residues are causing great damage to local environmental conditions. It is likely that the local government may consider “taking resolute and determined measures” to reduce or even abolish the garlic production in Eryuan County through a mandatory land transfer practice. Only in this way can the local area significantly reduce widespread pollution from overuse of fertilizers and pesticides to ensure the water quality and environment in Erhai Lake are successfully improved and protected. But will the local garlic growers return to poverty if they are forced to give up growing garlic?
Lucid waters and lush mountains are invaluable assets
Historically, Toyooka City, Hyogo Prefecture in Japan served as the habitat for wild Oriental White Storks (Ciconia boyciana), and was also one of the most famous rice production areas in Japan. Since the Meiji Restoration (1868-1912) when Japan began to develop into a modern society, the local farmers began to apply large amounts of pesticides and fertilizers so as to raise rice production and meet the growing needs for rice. As a result, the number of insects and frogs in the fields and surrounding wetlands declined sharply, and food sources for the wild Oriental White Storks gradually disappeared.
During the same period of time, most of the lands in Hyogo Prefecture suffered pesticide pollution, resulting in the gradual loss of rice paddy fields. In 1971, the last wild Oriental White Stork in Japan died, indicating the species became extinct in the wild in the country. Having drawn lessons from this bitter experience, Japan started to introduce the species from foreign countries and conducting artificial breeding. Meanwhile, Hyogo Prefecture also realized the importance of protecting the rural environment, moving to strictly limit the application of pesticides and fertilizers. Through three decades of conservation efforts, the wild habitats for Oriental White Stork have been restored, the streams have reappeared in rice paddy fields, and fish and shrimps are found swimming in ponds and swamps.
The first batch of Oriental White Stork was reintroduced to the wild in 2005. Two years later, the first baby bird was born in the wild. When the wild Oriental White Storks gradually returned to the paddy fields in flocks, the local people were pleasantly surprised to find the rice produced in these paddy fields has become more delicious, whose nutrition and flavor was much better than that in other rice production areas. Although the unit production of the rice was reduced due to non-application of fertilizers and pesticides, the quality of soil organic matters was been significantly improved, resulting in higher prices for environmentally friendly rice , as well as the increase of incomes for local rice farmers. Hence the rice was named as “Oriental White Stork-friendly Rice”.
The idea that “rice grown in the paddy fields with Oriental White Storks is the most delicious” has been recognized by rice farmers in Japan. By restoring the local environment and changing the traditional planting practices, Toyooka City has abandoned its old habit of large-scale fertilizer application while highlighting that the ecological cultivation of rice can result in a higher quality and higher price. The new concept has brought prosperity and resources to the local people, while enabling them to enjoy clear rivers and green mountains again,
A balance between protecting Erhai Lake and producing garlic is possible
The Chinese central government’s No.1 Document in 2017 focused on the supply-side structural reform in agriculture, stressing the need to increase incomes of farmers, improve efficiency of agriculture and make the rural areas greener. Like industry, agriculture in China also urgently needs structural adjustment. China’s grain production has increased for 12 consecutive years. However, many high quality agricultural products still need to be imported from foreign countries. This is similar to the case in China’s steel industry: although its steel production ranks first worldwide, special functioned steel still relies heavily on imports. With the population growth and higher living standards in urban areas, demand for environmentally responsible food is increasing, and food safety has attracted increasing attention due to its importance.
China’s agriculture needs to change its traditional practice characterized by high production and low quality and focus on eco-agricultural practices in order to maximize both quality and price. This could help optimize the supply structure, improve environmental benefits, address climate change and increase farmers’ incomes. The key to achieving these objectives is to focus on farmland quality, change the existing farming practice, and promote agricultural information development, as well as scientific and technological innovation.
In Dali, single-clove garlic—a major economic crop that helps lift local farmers out of poverty—has been a primary target of blame for Erhai Lake’s pollution problem. Local policymakers are now faced with the dilemma of choosing between environmental protection and economic development. So, is it possible to both maintain the production of single-clove garlic, a crop unique to Eryuan, with ecological planting, and eliminate pollution to the lake by cutting or even stopping the application of pesticides and fertilizers? Furthermore, can the incomes of garlic growers be increased under the new ecological planting practice? If the three objectives could be achieved at the same time, would it not be a perfect demonstration of agricultural supply-side reform?
To explore the ecological planting practice of garlic in the Eryuan river basin, Beijing Goldenway Bio-tech (BGB) Company, the winner of the 2017 Paulson Prize for Sustainable Cities, has worked closely with the Agricultural Technologies Promotion Center under the Agriculture Bureau of Eryuan County and other organizations to investigate the farming practice of garlic in Eryuan County, where the Erhai Lake originates. Three major water systems flowing into Erhai Lake—Miju, Luoshi and Yong’an rivers—flow through the county. It is also a major area for planting garlic in the Erhai Lake basin.
To maximize garlic production, the local farmers have previously applied excessive amounts of fertilizers. Throughout the year, the amount of fertilizers applied in each mu has reached nearly 200kg, well above the national mean value in China, and far exceeding the upper limit of 15kg per mu designated by the developed countries to prevent over-application of chemical fertilizers from jeopardizing water safety. Moreover, Eryuan County is well known for its livestock and poultry production. Each year, approximately one million tons of livestock and poultry feces are generated, nearly 60% of which fail to be treated and are returned to farmlands for reuse. These pollutants, following rain leaching, flow into Erhai Lake with runoff transfer, diffusion, and infiltration, becoming one of the major sources of agricultural non-point pollutants.
The Investigation Team also visited the surrounding areas of the three major rivers flowing into Erhai Lake in Eryuan County to understand the garlic planting in the 60,000 mu of farmlands. It was found that such problems were common: over-application of fertilizers in garlic growing; serious eutrophication of farmland soils; increasing potential risks of heavy metals and pests in soils due to application of untreated urines and feces; and imbalance of biological populations in the soil ecosystem. According to reports, the annual loss of nitrogen and phosphorus in farmlands in northern Erhai Lake has become very serious.
The three rivers have become the most significant sources of pollution to Erhai Lake. The water quality of these three rivers was generally defined as Class IV, and clearly tended to change with the seasons. The total levels of N and P in water bodies tended to increase month by month during the period from October-December to January-March in the next year, and decrease slightly or stabilize month by month during the period from May to August. This seasonal change exactly coincides with the garlic planting period, indicating that the three tributaries are representative of the agricultural non-point pollutants flowing into the Erhai Lake basin. Since the three rivers account for 60% of the annual replenished water and 50% of the total N and P input in Erhai Lake, their water quality will undoubtedly have a major impact on the water quality of the lake. In this sense, Eryuan County has become a key area for preventing and controlling pollutants from rivers that flow into Erhai Lake from the north.
To further explore eco-agriculture planting and water and soil conservation in the Erhai Lake basin, BGB rented 51 mu of local garlic-growing farmlands to conduct experiments during the garlic planting season of 2016-2017. With the eco-planting principles of “substituting organic for chemical fertilizer, and biological pesticide and physical control for highly-toxic chemical pesticides”, comparative experiments and studies on two options (reduced application of chemical fertilizers and pesticides by 30%, or “planting with reduced discharge”; and zero-application of chemical fertilizers and pesticides, or “planting with zero discharge”) were conducted using the “biologically enhanced humus-based fermentation technology” that won the National Golden Prize of Patents and the National Award for Technological Invention. The experiments also used special organic manure for garlic production, which is converted from local livestock and poultry feces in a cost-effective manner. Following the studies, it was concluded that:
- The per-unit production target should be defined according to comprehensive economic benefits. The results showed that the per-unit production target can be reached under the two options.
- The content of garlicin, a major bioactive ingredient in garlic, under the practice of planting with zero discharge and reduced discharge grew by 33% and 13% respectively, as compared to the traditional planting method. This means that the garlic under the two new planting methods has both a higher nutritional value and a higher potential market price.
- The mean discharge reduction rate of total N and P in water bodies under the practice of planting with zero discharge reached 78% and 74% respectively, while those figures under the practice of planting with reduced discharge were calculated to be 55% and 53% respectively.
- If garlic is grown in more than 200,000 mu of farmlands surrounding the three river basins and the practice of planting with zero discharge is employed, and all the livestock and poultry feces across Eryuan County are converted into resources in a cost-effective way before they are safely returned to farmlands for reuse, the water quality in the three rivers can be improved from Class IV to Class II. Even if the practice of planting with reduced discharge is employed, the water quality can be improved to Class III.
At the end of August 2017, five well-respected scholars and experts on garlic planting in Japan were invited by BGB to visit China. These Japanese scholars and experts, together with leaders from the Agriculture Bureau of Jinxiang County in Shandong Province, where the National Garlic Trading Center is located, and experts from the Garlic Research Institute under the Science and Technology Commission of Jinxiang County, gathered in Eryuan County to hold a two-day meeting on transforming local garlic planting into an eco-agricultural practice. The participants agreed that the single-clove garlic in Eryuan County has a great potential in helping reduce discharge of pesticides and fertilizers, while studies should be enhanced and ecological planting practices should be promoted for other crops (e.g., alpine vegetable, pear, grape and walnut). If ecological planting practice can be fully implemented in the agricultural counties around Dali, the agricultural non-point pollutants will be significantly reduced, and the water quality in Erhai Lake fundamentally improved.
To fully promote ecological planting practices, however, many issues need to be studied and resolved. Instead of simply stopping the application of pesticides and fertilizers, ecological planting requires innovation of husbandry techniques, support in terms of planting science and technology, soil testing and data analysis. Public awareness and demonstration also play a crucial role in promoting ecological planting practices, as most farmers are unwilling to take the risk of trying a new planting practice. Meanwhile, the large-scale development of eco-agriculture is not possible without many key factors such as the farmland transfer mechanism, pricing mechanism of quality products, processing industry chain of organic products, soil testing and formulated fertilization, promotion of farm machinery, organic fertilizers quality standard, water-saving irrigation, and e-commerce of agricultural materials. It should be realized that sustainable urbanization depends heavily on sustainable agricultural development in China; like two sides of a coin, the two are inseparable from each other. Many basic living materials, such as safe food and drinking water, cannot be made available for urban areas without a clean rural environment.
The experiments in Eryuan County have provided valuable ideas and inspiration on how to balance economic development and environmental protection. While helping protect clear rivers and green mountains, eco-agriculture can help improve the quality of local crops and enable local farmers increase their incomes and lift themselves out of poverty.