摘要
土壤有机质是土壤肥力的基础,也是衡量土壤肥力的重要指标之一,对作物产量有直接贡献。西藏土壤有机质含量对作物的生长起到决定性作用,对西藏土壤有机质现状与影响因素进行研究,可以了解西藏土壤肥力状况,实现农业生产的可持续发展。通过对西藏温暖半湿润区、温暖半干旱区、温凉半湿润半干旱区3个主要气候区的主要农田土壤取样分析有机质含量,并研究土壤有机质含量与海拔、年降水量、年积温和农田有机肥施用量等影响因素的相关关系,结果显示:西藏土壤有机质含量较低平均值为24.51 gkg-1,有机质的分布有明显的地域特征,呈现东部高西部低的状况,从全区范围看土壤有机质变异较大,导致变异的因素主要是气候原因。土壤有机质与海拔、年降水量、年积温和农田有机肥施用量四种因素均呈显著相关关系,除与海拔呈负相关关系外,与其他三种因素均呈正相关关系。
Soil organic matter is the basis of soil fertility,and also one of the important indexes of soil fertility,have a direct contribution to crop yield.Organic matter content of the soil play a decisive role on crop growth,so the study on soil organic matter status and influencing factors in Tibet,can understand soil fertility status of the Tibet,and achieve the sustainable development of agricultural production.The analysis on the organic matter content of sampling soil from the 3 major climatic zones including warm and semi-humid region,warm and semi-arid region,and temperate,cool semi-humid and semi-arid region,and research on the correlation between soil organic matter content、 altitude,annual precipitation、accumulated temperature and application of organic manure,the results show:the average of soil organic matter content in Tibet is 24.51 gkg-1,the distribution of organic matter has obvious geographical characteristics,showing higher in the east,and lower in the west.Because of the climate,soil organic matter varied greatly in Tibet.There was a significant correlation between soil organic matter and altitude,annual precipitation、accumulated temperature and application of organic manure,but the three factors were positively correlated but altitude.
出处
《西藏农业科技》
2014年第1期12-17,共6页
Tibet Journal of Agricultural Sciences
关键词
西藏
有机质
相关性分析
Tibet
organic matter
correlation analysis
