Quantifying and optimizing agroecosystem services in China's Taihu Lake Basin
文献类型：期刊论文
| 作者 | Xu, Xibao; Liu, Jingping; Tan, Yan; Yang, Guishan |
| 刊名 | JOURNAL OF ENVIRONMENTAL MANAGEMENT
 |
| 出版日期 | 2021 |
| 卷号 | 277 |
| 英文摘要 | This study examines rice-wheat agroecosystems in the Taihu Lake Basin: one of China's largest commercial grain-farming areas and a region that has faced severe deterioration in water quality. Spatiotemporal changes over the period 1986-2015 in four key ecosystem services (ESs) - grain yield, nitrogen loss, N2O emission, and soil organic carbon (SOC) accumulation - were examined by applying the Agricultural Production Systems Simulator (APSIM) across the basin at county level. Two straw return modes (namely, full straw return versus no return) and three fertilizer-use reduction modes (-5%,-10%, and-20%) were set up to generate six combined scenarios, to propose pathways that reduce the variability of grain production and improve water quality by reducing loss of nitrogen (N loss) - in consideration of the Basin's vital role in agricultural production and the need to protect water quality. Results show that annual grain yield and net five-year difference in SOC accumulation exhibited an overall downward trend from 1986 to 2015, while N2O emission and N loss increased. Two pairs of ESs showed desirable synergies (increasing grain yield and increasing SOC accumulation; decreasing N2O emission and decreasing N loss), encompassing 45.8% and 2.4% of total cultivated land area respectively. Another two pairs exhibited desirable trade-offs (increasing SOC accumulation and decreasing N loss; increasing SOC accumulation and decreasing N2O emission), accounting for 19.0%, and 2.4% of total cultivated land area respectively. There was considerable overlap within counties, which showed high values of grain yield, N2O emission, nitrogen loss, and SOC accumulation in the Basin; but values were relatively high in the east and relatively low in the west. Fertilizer use has significant positive correlations with grain yield and SOC accumulation, and it reduces N loss and N2O emission. Straw return was predicted to raise grain yields and net fiveyear difference in SOC accumulation and to reduce N loss, but also to increase N2O emissions. Recommended strategies to reduce N loss and stabilize grain supply in the study area are 1) reducing fertilizer use by 20% in areas where N application was above 490 kg N/ha, and 2) implementing straw return and reducing fertilizer use by 5% for areas where N application ranged between 380 and 490 kg N/ha. |
| 源URL | [http://159.226.73.51/handle/332005/20705]  |
| 专题 | 中国科学院南京地理与湖泊研究所 |
| 推荐引用方式 GB/T 7714 | Xu, Xibao,Liu, Jingping,Tan, Yan,et al. Quantifying and optimizing agroecosystem services in China's Taihu Lake Basin[J]. JOURNAL OF ENVIRONMENTAL MANAGEMENT,2021,277. |
| APA | Xu, Xibao,Liu, Jingping,Tan, Yan,&Yang, Guishan.(2021).Quantifying and optimizing agroecosystem services in China's Taihu Lake Basin.JOURNAL OF ENVIRONMENTAL MANAGEMENT,277. |
| MLA | Xu, Xibao,et al."Quantifying and optimizing agroecosystem services in China's Taihu Lake Basin".JOURNAL OF ENVIRONMENTAL MANAGEMENT 277(2021). |
入库方式： OAI收割
来源：南京地理与湖泊研究所
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