摘要
【目的】为阐明西藏高原农牧交错带不同土地利用方式对表层土壤含水量的影响。【方法】以拉萨市林周县农田和相邻草地为研究对象,使用土壤水分测定仪测定表层0~5cm土壤含水量,并采用统计学方法研究土壤含水量的统计特征及空间分布模型。【结果】①土壤含水量表现为草地显著高于农田(P<0.01),农田和草地均属于中等变异,变异系数分别为26%和25%;②农田和草地土壤含水量分别符合球状模型、指数模型,模型块金值/基台值分别为3.68%和6.58%,均具有高度的空间依赖性;农田-草地土壤含水量符合球状模型,块金值/基台值为34.57%,具有中等程度的空间依赖性;农田和草地具有相似的有效变程(Range),而农田-草地有效变程则显著高于单一土地利用方式,值分别为9.43、10.65和39.42m;③从克里格插值分布图来看,农田和草地土壤含水量均表现为中部较高,边界较低,整体呈自中部向周边减少的趋势。【结论】结果可以为高寒农牧交错带土地的合理利用,及对土壤含水量的科学预测提供参考。
【Objective】 Soil water content is an important influence factor on plant growth and nutrient transformation, which is greatly influenced by land use types.【Method】In order to elucidate the effects of different land use type on surface soil water content in the ecotone of agriculture-animal husbandry in the Tibetan plateau, taking the farmland and adjacent grassland in Linzhou County as the research objects, and using soil moisture meter measures soil water content of 0-5 cm in the surface layer, the classical statistical methods were used to analyze the statistical characteristics of soil moisture in farmland and grassland, and the geostatistical tools, Semi-variance function and Kriging interpolation were used to analyze the spatial distribution models and characteristics of soil water content.【Result】(i) The soil water contents in grassland were significantly higher than that in farmland ( P <0.05), with values of (18.68 %±4.7 %) and (9.73 %±2.5 %), respectively. The soil water contents of farmland and grassland belonged to moderate variation with coefficient of variation values of 26 % and 25 % respectively;(ii) The soil water content of farmland and grassland respectively met with spherical model, exponential model, and the nugget/sill ratio were 3.68 % and 6.58 % respectively, which both belonged to high degree of spatial dependence. The soil water content of farmland-grassland accorded with the spherical model, the nugget/sill ratio was 34.57 % and had moderate degree of spatial dependence. Farmland and grassland have similar effective range, while farmland-grassland s effective range is significantly higher than single land use, with values of 9.43, 10.65 and 39.42 m respectively;(iii) According to the Kriging interpolation maps, the soil water content of farmland and grassland are both higher in the middle part and lower in the boundary part, the overall trend showed reducing from the central to the boundary.【Conclusion】The results can provide useful information for land appropriate uses and soil water contents prediction in the ecotones of agriculture-animal husbandry of the Tibetan plateau region.
作者
连玉珍
曹丽花
刘合满
杨红
郭丰磊
韩晓浩
LIAN Yu-zhen;CAO Li-hua;LIU He-man;YANG Hong;GUO Feng-lei;HAN Xiao-hao(Research Institute of Tibet Plateau Ecology, Xizang Agriculture and Animal Husbandry College, Tibet Linzhi 860000, China;Tibet Key Laboratory of Forest Ecology in Plateau Area, Ministry of Education, Tibet Linzhi 860000, China;National Key Station for Field Scientific Observation & Experiment, Tibet Linzhi 860000, China;Faculty of Forest Resources and Environmental Science, Tibet Agriculture & Animal Husbandry University, Tibet Linzhi 860000, China)
出处
《西南农业学报》
CSCD
北大核心
2019年第5期1092-1097,共6页
Southwest China Journal of Agricultural Sciences
基金
国家自然科学基金项目“西藏高寒农牧交错带生态系统土壤有机碳物理保护下的化学稳定机制”(41561052),国家自然科学基金项目“西藏色季拉山土壤微生物的海拔梯度分异与温度变化响应”(41461055)
西藏农牧学院研究生创新计划资助项目“色季拉山林-灌-草生态系统土壤有机碳、氮空间分布与模拟”(YJS2018-13)
关键词
土壤含水量
空间分布
农田
草地
西藏
Soil water content
Spatial distribution
Farmland
Grassland
Tibet
