期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 650, 期 -, 页码 2251-2259出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2018.09.275
关键词
Manure application; Straw incorporation; Residual nitrate-N; Long-term experiment; Nonpoint source pollution
资金
- National Key Research and Development Program from the Ministry of Science and Technology of the People's Republic of China [2016YFD0800101]
- Fundamental Research Funds for Central Non-Profit Scientific Institutions [821-25, 821-31]
- Special Fund for Agro-Scientific Research in the Public Interest from the Ministry of Agriculture of the People's Republic of China [201303089, 201003014]
- Newton Fund [BB/N013484/1]
- National Natural Science Foundation of China [41301311]
The effects of long-term animal manure application and crop straw incorporation on the migration of carbon (C) and nitrogen (N) deep into the soil profile and the associated N leaching risk in particular have not been thoroughly elucidated to date. Soil profile samples were collected from depths of up to 200 cm from the following four treatments in a 27-year field experiment on the North China Plain: N + phosphorus (P) + potassium (K) fertilizers (NPK), NPK + 22.5 t ha(-1) swine manure (NPKM), NPK + 33.7 t ha(-1) swine manure (NPKM+) and NPK + straw incorporation (NPKS). The results revealed that long-term manure application and straw incorporation significantly enhanced the soil organic C (SOC) and total N (TN) contents in the upper 20 cm and that this effect was weaker in the deeper soil layers (P < 0.05). Residual nitrate-N (NO3--N) contents at 0 to 40 cm and 120 to 200 cm in the NPKM and NPKM+ were 4-16 and 2-9 times higher than those in the NPK and NPKS, respectively. These results indicated a greater potential for N leaching from manure addition and a higher propensity for NO3--N leaching out of the 40-100 cm soil layer. Pearson relationship analysis demonstrated that NO3--N content was clearly affected by SOC and dissolved organic N (DON) contents along the soil profile (20-200 cm), implying that the higher residual NO3--N contents in the deeper soil from manure addition were partially attributable to the mineralization and nitrification of the downward SOC and DON. Interestingly, a low level of residual NO3--N combined with negative mineralization in the 120-200 cm soil layers of the NPKS treatment was observed, suggesting that straw incorporation promotes soil NO3--N retention. Thus, we concluded that long-term manure application is beneficial for soil NO3--N content retention, whereas long-term straw incorporation benefits NO3--N retention. (C) 2018 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据