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首页> 外文期刊>Journal of the American Water Resources Association >AGRICULTURE LAND-USE EFFECTS ON NUTRIENT LOSSES IN WEST TIAOXI WATERSHED, CHINA
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AGRICULTURE LAND-USE EFFECTS ON NUTRIENT LOSSES IN WEST TIAOXI WATERSHED, CHINA

机译：潮西流域农业土地利用对养分流失的影响

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摘要

Five types of land use/land covers in the West Tiaoxi watershed of China were studied for nutrient losses in artificial rainstorm runoff. A self-designed rainfall simulator was used. In situ rainfall simulations were used to: (1) compare the concentrations of nitrogen and phosphorous in different land use/land covers and (2) evaluate the flux of nitrogen and phosphorous export from runoff and sediment in various types of land use/land covers. Three duplicated experiments were carried out under rain intensity of 2 mm/min, each lasting 32 minutes on a 3 m~2 plot. Characteristics of various species of nitrogen and phosphorous in runoff and sediment were investigated. The results showed that the concentrations of total nitrogen (TN) and total phosphorous (TP) were greatest in runoff from mulberry trees and smallest from pine forest. The TN and TP export was mainly from suspended particulate in runoff. TN and TP exports from the top 10 cm layer of five types of land use/land covers were estimated as high as 4.66 to 9.40 g/m~2 and 2.57 to 4.89 g/m~2, respectively, of which exports through sediment of runoff accounted for more than 90 percent and 97 percent. The rate of TN and TP exports ranged from 2.68 to approximately 14.48 and 0.45 to approximately 4.11 mg/m~2/min in runoff; these rates were much lower than those of 100.01 to approximately 172.67 and 72.82 to approximately 135.96 mg/m~2/min in the runoff sediment.
机译：对中国西部T西流域的五种土地利用/土地覆盖类型进行了人工降雨暴雨径流中养分流失的研究。使用了自行设计的降雨模拟器。原位降雨模拟用于：（1）比较不同土地利用/土地覆盖下氮和磷的浓度，（2）评估各种土地利用/土地覆盖下径流和沉积物中氮和磷的出口通量。在2 mm / min的降雨强度下进行了三个重复的实验，每个实验在3 m〜2的区域上持续32分钟。研究了径流和沉积物中各种氮磷的特征。结果表明，桑树径流中总氮（TN）和总磷（TP）的浓度最高，而松林中的最低。总氮和总磷出口主要来自径流中的悬浮颗粒。估计五种土地利用/土地覆被的前10厘米层的总氮和总磷出口分别高达4.66至9.40 g / m〜2和2.57至4.89 g / m〜2，其中通过径流分别占90％和97％。径流中总氮和总磷的出口量在2.68至约14.48和0.45至约4.11 mg / m〜2 / min的范围内。在径流沉积物中，这些速率远低于100.01至约172.67和72.82至约135.96 mg / m〜2 / min。

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