JOURNAL OF NATURAL RESOURCES ›› 2018, Vol. 33 ›› Issue (10): 1755-1766.doi: 10.31497/zrzyxb.20171081

• Resource Ecology • Previous Articles     Next Articles

Effects of Combined Application of Chinese Milk Vetch (Astragalus sinicus L.) and Nitrogen Fertilizer on Ecological Service Function of Paddy Field

MA Yan-qin1,2, HUANG Guo-qin2   

  1. 1. Jiangxi College of Foreign Studies, Nanchang 330099, China;
    2. Research Center on Ecological Science, Jiangxi Agricultural University, Nanchang 330045, China
  • Received:2017-10-16 Revised:2018-03-06 Online:2018-10-20 Published:2018-10-20
  • Supported by:
    National Key R & D Program, No. 2016YFD0300208; National Natural Science Foundation of China, No. 41661070.

Abstract: Chinese milk vetch (Astragalus sinicus L.) is an important green manure crop in paddy fields in South China. When returned to field, it can replace part of nitrogen fertilizer and reduce the amount of fertilizer, and improve the yield and quality of agricultural products. In this study, based on the agro-ecosystem service appraisal theory, we used methods in ecological economics to develop a systematic model to evaluate the ecological services value of paddy fields when combining Chinese milk vetch and nitrogen fertilizer in paddy fields in South China. This model considered the unique properties of green manuring, and the ecological services value were estimated by considering the influence of green manure on four ecological services functions including crop production, gas regulation, water conservation, and soil nutrient accumulation. Results showed: Chinese milk vetch with nitrogen increased the total value of paddy field ecosystem service function. Compared with the fallow treatment, the treatment with Chinese milk vetch increased 7.56%-20.83% of total output of agricultural products, 21.64%-37.61% of gas regulation function, 8.74%-26.26% of soil nutrient accumulation function, and 15.15%-41.39% of total value of ecosystem services. The effect is even better when combining Chinese milk vetch and fertilizer. Under the combined treatment with Chinese milk vetch and optimized nitrogen, total value of agricultural product supply, ratio of output to input, gas regulation value and conservation of water all reached the highest. This study preliminarily counted the total ecosystem service values of paddy fields under treatments with combining Chinese milk vetch and different amount of nitrogen. It had benefits to understanding of the comprehensive value of Chinese milk vetch, and the findings provided theoretical basis for decision making in planting green manure.

Key words: Chinese milk vetch, ecological service function, nitrogen fertilizer, value

CLC Number: 

  • S181