晋西黄土区林草复合界面土壤水分养分分布规律研究  

Distribution of Soil Moisture and Nutrients at the Grassland-Forestland Interface in the Loess Region of West Shanxi Province

作　　者：马雯静[1] 毕华兴[1] 云雷[1] 陈攀攀[1] 田晓玲[1] 

机构地区：[1]北京林业大学水土保持学院,水土保持与荒漠化防治教育部重点实验室,山西吉县森林生态系统国家野外科学观测研究站,北京100083

出　　处：《水土保持研究》2009年第5期78-82,共5页Research of Soil and Water Conservation

基　　金：国家“十一五”科技支撑项目“黄土区农林复合系统可持续经营技术研究”(2006BAD03A0503)

摘　　要：通过对晋西黄土区刺槐林与天然草带的复合界面及其对照(林地、草地)生长季土壤水分和养分(有机质、全氮、速效氮和速效钾)的测定,分析比较了其水分和养分的空间分布特征及其变化规律。结果表明,不同土壤层次的土壤含水量在水平方向上存在差异,在浅层土壤(0-20cm),土壤含水量从大到小依次为:草地、林地、林草界面,在深层土壤(20-100cm),土壤含水量从大到小依次为:草地、林草界面、林地;在垂直方向上,随着土层深度的增加,研究区林地、草地、林草界面的土壤含水量表现为逐渐降低的趋势,刺槐林地在60-100cm土层中土壤含水量有少许回升。研究区复合类型内土壤养分分布不均衡,水平方向上有机质平均含量为林草界面<草地<林地;全氮平均含量为林草界面最小,草地与林地相差不大;速效磷平均含量为林地<草地<林草界面;速效钾平均含量为草地<林草界面<林地;垂直方向上,各个生态类型的有机质含量、全氮含量、速效钾含量随着土壤层次的加深逐渐减少,而速效磷含量在土壤的不同层次呈现不同的变化。Based on the determination of soil moisture and nutrients at the grassland--forestland interface in the Loess Region of West Shanxi, comparative analysis of soil moisture and nutrients distribution and spatial variability were carried out. The results indicated that： the soil moisture between different soil layers under interface in horizontal direction presented different for different kinds. In 0-20 cm soil layer the soil moisture content is grassland〉forestland〉grassland--forestland, and in 20--100 cm soil layer the soil moisture content is grassland〉grassland-forestland〉forestland. With increasing soil depths, the soil moisture showed reducing tendency but increased in forestland in 60-100 cm soil layer. The soil nutrients were unevently distributed. In horizontal direction, the average content of organic matter is grassland-forestland〈grassland〈forestland, the average content of total N of forestland--grassland interface is the least and that of forestland is the same as of grassland, the average content of available P is forestland〈 grassland〈grassland forestland, the average content of available K is grassland〈grassland--forestland 〈forestland. In vertical directions, the content of organic matter and total N and available K reduced with the increasing soil depths in forestland and grassland as well as forestland--grassland interface, but the content of available P varied irregularly.

关 键 词：林草复合界面 土壤水分 土壤养分 晋西黄土区 

分 类 号：S812.2[农业科学—草业科学] S152.7[农业科学—畜牧学]