Effects Of Alternating Drying And Wetting On Soil Nitrogen And Phosphorus Loss In Root Zone Of Dominant Plants In Phosphorus-rich Mountainous Areas

Abstract

In the mountainous area of Yunnan-Guizhou Plateau, phosphorus and nitrogen are important factors that limit primary productivity and affect the distribution of plant communities. Alternation of wet and dry has a significant effect on the migration of various elements such as C, N, and P in soil. Taking the rhizosphere soil of the dominant plants in the phosphorus-rich mountainous area in the Dianchi Lake Basin as the research object. Six sets of different humidity treatment methods: blank constant humidity, blank dry and wet alternation, nitrogen constant humidity, nitrogen addition dry and wet alternation, carbon constant humidity, and carbon add dry and wet alternation were assessed. Responses of soluble total nitrogen and soluble total phosphorus to six treatments in plant root zone were investigated. The results showed that the contents of dissolved total nitrogen (DTN) and dissolved total phosphorus (DTP) in soil leachate and their changes of Erianthus rufipilus and Eupatorium adenophorum under different treatment conditions increased first and then decreased. In the carbon addition group, the DTN content of the soil leachate in the alternating dry and wet treatment was significantly higher than that in the constant humidity treatment, but there was no significant difference in the nitrogen addition group. The three factors of water treatment and sampling time have significant effects on the DTN content of soil leachate, and the interaction between the three also has a significant effect on it. Bangladesh J. Bot. 51(4): 855-862, 2022 (December) Special

Laws Governing Nitrogen Loss and Its Numerical Simulation in the Sloping Farmland of the Miyun Reservoir

“…For example, Zhou et al monitored and studied the SF sediment yield of loess slopes under different vegetation cover types [13], while another study [14] evaluated the characteristics of NP loss associated with SF and SSF on different land types in the Hun-River Basin in Liaoning Province. Wang Guozhong et al studied the NP loss on different land types in the mountainous areas of southwest Henan Province [15], whereas Lv Ting et al explored the same along with SF in the catchment area of the Hexi Reservoir in Changxing County based on different land use types [16]. Additionally, some scholars have studied how different soil and water conservation measures have impacted runoff generation and NP loss.…”