JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2019, Vol. 43 ›› Issue (01): 98-104.doi: 10.3969/j.issn.1000-2006.201806022

Previous Articles     Next Articles

Characteristics of nitrogen and phosphorus runoff of wheat-rice double cropping field and poplar forest land in intersection area of Hung-tse Lake

LI Jiping,XU Yongfeng,CHEN Zipeng,HAN Jiangang,LI Wei,LI Pingping   

  1. Co-Innovation Center for the Sustainable Forestry in Southern China, College of Biology and the Environment,Nanjing Forestry University,Nanjing 210037,China
  • Online:2019-01-28 Published:2019-01-28

Abstract: 【Objective】The loss of nitrogen and phosphorus has become one of the most important sources of agricultural non-point source pollution. The purpose of this study was to explore and compare the characteristics of rainfall runoff and the regularities of nitrogen and phosphorus loss in runoff water of a wheat-rice double cropping field and poplar forest land.【Method】In this study, the surface runoff and nitrogen and phosphorus loss were monitored in the intersection area of Hung-tse Lake and Huaihe River for one year by collecting runoff.【Result】 The minimum rainfall that produced runoff from the wheat field, rice field, and poplar forest land was 4.2, 3.3 and 22.8 mm, respectively. With the increase of rainfall, the increase of the poplar forest runoff was much lower than that of the farmland. The total nitrogen, nitrate nitrogen, total phosphorus, and soluble phosphorus loss were not significantly correlated with rainfall, but the loss of different states of nitrogen and phosphorus increased with the increase in rainfall. The wheat field and poplar forest land were usually in the dry condition, where nitrogen loss was mainly caused by nitrate nitrogen and phosphorus loss was primarily caused by particulate phosphorus. The rice field was in a flooded condition, and the loss of nitrogen and phosphorus was caused by ammonia nitrogen and soluble phosphorus, respectively. The nitrogen and phosphorus loss in the poplar forest was lower than that of the farmland, and the total loss in a year of total nitrogen, soluble nitrogen, nitrate nitrogen, and ammonia nitrogen in the polar forest land was 22.61%, 23.79%, 23.46% and 24.59% that of the farmland, respectively. Total phosphorus, soluble phosphorus, and orthophosphate in the polar forest land was 0.81%, 0.77% and 0.67% that of the loss in farmland, respectively. 【Conclusion】Therefore, forest land can better control the loss of runoff nutrients compared with farmland, and plays an important role in the control of non-point source pollution.

CLC Number: