农业资源与环境学报Issue(6)：545-551,7.DOI:10.13254/j.jare.2015.0143
新疆绿洲长期连作棉田土壤氮储量及其垂直分布特征
Storage and Vertical Distribution Characteristics of Nitrogen in the Continuously Cropped Cotton Field in Xinjiang Oasis, China
摘要
Abstract
The objective of the experiment was to investigate the storage and vertical distribution characteristics of nitrogen in the continuous-ly cropped cotton field in Xinjiang oasis. This experiment was conducted at the Shihezi University experiment station in Shihezi, China. The experiment consisted of seven continuous cropping periods(1, 5, 10, 15, 20, 25 years and 30 years)and three soil depths(0~20, 20~40 cm and 40~60 cm). Results showed that soil total nitrogen storage increased as the duration of continuous cropping increased, but the degree of increase of continuous cropping treatments were different, the soil total nitrogen storage initially increased obviously in the 5 years and 10 years treatment, and then increased slowly after 10 years. As for the growth rate, 0~60 cm depth soil nitrogen storage’s growth rate showed initially decreased, then increased, and then stabilized as the duration of continuous cropping increased. Besides, soil total nitrogen content had significantly negative correlation with soil bulk density. As for different soil depths, the soil total nitrogen storage of each continuous cropping periods decreased as the soil depth increased, and surface soil(0~20 cm depth)nitrogen storage was higher than deeper soil(20~40 cm depth and 40~60 cm depth). Besides, with the year of continuous cropping increased, the properties of surface-aggregation of total nitro-gen storage in 0~60 cm depth soil became more obviously. As for different years of continuous cropping, with the year of continuous cropping increased from 5 years to 10 years, the soil nitrogen storage of three soil depths(0~20, 20~40 cm and 40~60 cm)were all increased, however, after long- term continuous cropping(10~30 years), the soil nitrogen storage of 20~40 cm depth increased gradually, but the 40~60 cm depth increased more slowly. In a word, the nitrogen of Xinjiang oasis cotton field was nitrogen sink, besides, continuous cropping could in-crease the soil nitrogen storage of 0~20, 20~40 cm and 40~60 cm depth, improve the soil nitrogen supplying capacity in the continuously cropped cotton field in Xinjiang oasis.关键词
新疆绿洲/棉花/连作/全氮储量/分布特征Key words
Xinjiang oasis/cotton/continuous cropping/total nitrogen storage/distribution characteristics分类
农业科技引用本文复制引用
景峰,郭成藏,谈建鑫,康亚龙,曹晶晶,田宝庚,刘建国..新疆绿洲长期连作棉田土壤氮储量及其垂直分布特征[J].农业资源与环境学报,2015,(6):545-551,7.基金项目
国家自然科学基金项目 （）
