应用生态学报2018，Vol.29Issue(4)：1259-1265,7.DOI:10.13287/j.1001-9332.201804.025
丹江口库区覆膜土壤不同土层氮素矿化速率及其影响因素
Nitrogen mineralization rate in different soil layers and its influence factors under plastic film mulched in Danjiangkou Reservoir area, China
摘要
Abstract
The objective of this study was to investigate the rate of nitrogen mineralization in various soil layers (0-10,10-20,and 20-30 cm) and its influencing factors under plastic film mulching ridge-furrow in a corn field of Wulongchi small watershed,Danjiangkou Reservoir Area.Results showed that the rate of soil ammonification decreased with soil depth during the entire maize growth period.The rate of nitrification in seedling,jointing,and heading stages decreased in the following order:10-20 cm ＞ 0-10 cm ＞ 20-30 cm,while it increased with soil depth in maturation stage.The rate of soil nitrogen mineralization decreased with the increases in soil depth in the seedling,jointing and heading stages,whereas an opposite pattern was observed in maturation stage.Compared with non-filming,film mulching promoted the soil ammonification process in 0-10 cm and the soil nitrification and nitrogen mineralization processes in jointing,heading,and maturation stages in both 0-10 and 10-20 cm.However,the rates of soil nitrification and nitrogen mineralization under film mulching were much lower than those under non-filming in seedling stage.The stepwise regression analysis indicated that the main factors influencing soil nitrogen mineralization rate varied with soil depth.Soil moisture and total N content were the dominant controller for variation of soil nitrogen mineralization in 0-10 cm layer.Soil temperature,moisture,and total N content were dominant controller for that in 10-20 cm layer.Soil temperature drove the variation of soil nitrogen mineralization in 20-30 cm layer.关键词
覆膜土壤/土层/氮矿化速率/丹江口库区Key words
mulching soil/soil layer/nitrogen mineralization rate/Danjiangkou Reservoir area引用本文复制引用
于兴修,徐苗苗,赵锦慧,张家鹏,王伟,郭亚丽,肖娟花..丹江口库区覆膜土壤不同土层氮素矿化速率及其影响因素[J].应用生态学报,2018,29(4):1259-1265,7.基金项目
本文由国家自然基金科学项目(41471227)资助 （41471227）
This work was supported by the National Natural Science Foundation of China (41471227). （41471227）
