低丘红壤坡面土壤水分变化的气象因素冗余分析  

Relationships between soil moisture variability and meteorological factors on low hill red soil slope: A redundancy analysis

作　　者：韩湘云[1,2] 景元书[1,2] 李根[1,2] 

机构地区：[1]南京信息工程大学江苏省农业气象重点实验室,南京210044 [2]南京信息工程大学应用气象学院,南京210044

出　　处：《生态学杂志》2013年第9期2368-2374,共7页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(41175098);江苏省"青蓝工程"项目;教育部留学回国人员项目资助

摘　　要：土壤水分变化特征与影响因素分析对提高红壤地区农业生产和土地合理利用有重要意义。利用植被生态数量学中的冗余分析方法 RDA,结合江西鹰潭红壤坡面土壤水分数据,研究了风速、降水、水汽压、气温、相对湿度和日照时数等气象因子与土壤(剖面0～15、15～30、30～60和60～100 cm)水分的相关关系。结果表明:土壤水分呈现明显的季节变化,且受降水的强烈影响,表层受降水影响最大,土层越深受降水的影响越小;观测时间段内表层土壤含水量随时间的变异系数(CV)最大,土层越深CV越小;RDA排序图可以很好地表示土壤水分季节动态与气象因子的关系,气温、降水、相对湿度和水汽压是土壤水分季节变化的主控因子,且不同月份的主控因子不同,5、6月为降水与相对湿度,7、8月为气温与日照时数。鉴于土壤水分变异不仅受海拔、土层深度、土地利用方式等环境因子的影响,还受降水、气温等气象因子的作用,研究结果将为进一步综合分析土壤水分时空变异的影响因素提供参考。To analyze the soil moisture characteristics and related affecting factors is of impor- tance in improving agricultural production and rational land use in red soil regions. By using redundancy analysis method （RDA） and relevant data, this paper studied the relationships between the soil moisture （0-15, 15-30, 30-60, and 60-100 cm layers） variability and the meteorological factors （wind velocity, precipitation, vapor pressure, air temperature, relative humidity, and sunshine hours） on the low hill red soil slope in Yingtan of Jiangxi, China. The soil moisture in the study area had an obvious seasonal change, and was strongly affected by pre- cipitation. The moisture in surface soil layer was most affected by precipitation. The effects of precipitation on soil moisture decreased with soil depth. The coefficient of variation （CV） of sur- face soil moisture was high, but the CV became smaller when the soil layer was deeper. RDA or- dination diagram could well represent the relationships between the seasonal dynamics of soil moisture and the meteorological factors. Air temperature, precipitation, relative humidity, and vapor pressure were the main factors affecting the seasonal dynamics of soil moisture, and the main affecting factors in different months differed. In May and June, the main affecting factors were precipitation and relative humidity. In July and August, the main affecting factors were air temperature and sunshine hours. Therefore, the soil moisture variability was not only affected by the elevation, soil depth, land use patterns, and other environmental factors, but also by the pre- cipitation, temperature, and other meteorological factors. The findings of this study could be used as a reference to further comprehensively analyze the affecting factors of the spatiotemporal variability of soil moisture, and also, as the basis for the timely regulation of the hillside soil moisture status and crop water conditions.

关 键 词：土壤水分 气象因子 坡面 冗余分析 变异 

分 类 号：S152.7[农业科学—土壤学]