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

作　　者：于兴修 徐苗苗 赵锦慧 张家鹏 王伟 郭亚丽 肖娟花 YU Xing-xiu;XU Miao-miao;ZHAO Jin- hui ＊;ZHANG Jia-peng;WANG Wei;GU;XIAO Juan-hua(College of Resources and Environmental Science, Hubei University/Hubei Key Laboratory of Region Development and Environ- ment Response, Wuhan 430062, China)

机构地区：[1]湖北大学资源环境学院/区域开发与环境响应湖北省重点实验室,武汉430062

出　　处：《应用生态学报》2018年第4期1259-1265,共7页Chinese Journal of Applied Ecology

基　　金：国家自然基金科学项目(41471227)资助~~

摘　　要：以丹江口库区五龙池小流域玉米黄棕壤为例,利用原位土壤氮矿化试验,研究覆膜条件下0~10、10~20、20~30 cm土层土壤氮素矿化速率及其影响因素.结果表明:玉米生长期内,土壤氨化速率随土层加深呈逐渐降低的趋势;土壤硝化速率在苗期、拔节期、抽穗期表现为10~20 cm>0~10 cm>20~30 cm,在成熟期随土层加深呈逐渐升高的趋势;土壤氮矿化速率在苗期、拔节期、抽穗期随土层加深呈逐渐降低的趋势,在成熟期随土层加深呈逐渐升高的趋势.与无覆膜相比,覆膜会加快0~10 cm土壤氨化过程,也会提高拔节期、抽穗期和成熟期0~10、10~20 cm土层土壤硝化速率和氮矿化速率,但苗期覆膜土壤硝化速率、氮矿化速率均低于无覆膜土壤.逐步回归分析显示,土壤含水量和全氮含量是0~10 cm土壤氮矿化速率的主要影响因子,土壤温度、含水量、全氮含量是10~20 cm土壤氮矿化速率的主要影响因子,土壤温度是20~30 cm土壤氮矿化速率的主要影响因子.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 showed that the rate of soil ammonification period. The rate of nitrification in seedling order： 10-20 cm 〉 0-10 cm 〉 20-30 The rate of soil nitrogen mineralization small watershed, Danjiangkou Reservoir Area. Results decreased with soil depth during the entire maize growth , jointing, and heading stages decreased in the following cm, while it increased with soil depth in maturation stage 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 mineraliza- tion under film mulching were much lower than those under non-filming in seedling stage. The step- wise 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 

分 类 号：S153[农业科学—土壤学]