川滇干热河谷区土壤容重空间变异特征--以滇中楚雄地区为例

Spatial variability characteristics of the soil bulk density in the dry hot valley of Sichuan-Yunnan region:Taking Chuxiong area in Central Yunnan as an example

土壤容重是土壤最重要的物理性质之一,是植被恢复、生态修复和估算土壤有机碳储量的重要参数。滇中楚雄州北部特殊的地理位置和独特的地形地貌特征组合形成了典型的干热河谷气候和非干热河谷气候,为探讨土壤容重变化影响因素提供了极好的自然条件。通过系统实测土壤容重,采用统计学方法拟合容重传递函数,探讨了研究区内土壤容重特征和空间分布规律。结果显示:研究区干热河谷区土壤容重高,果园对土壤容重影响深度最大,燥红土容重最高,容重传递函数中有机碳贡献最大。研究结果可为干热河谷区生态保护修复、土壤碳储量估算提供基础数据和理论支撑。

Soil bulk density is one of the most important properties of soil,and it is an important parameter for vegetation restoration,ecological restoration and estimation of soil organic carbon storage.The typical dry hot valley climate and non-dry hot valley climate formed for the special geographical location and the unique combination of topography and geomorphology in the northern Chuxiong area of Central Yunnan,providing an excellent natural condition for influencing factors investigation of soil bulk density.The soil bulk density characteristics and spatial distribution were investigated by systematical field measurement and bulk-density transfer function using geostatistics methods.The result show that the soil bulk density in the dry hot valley was high,and the orchard had the greatest influence on the soil bulk density.And the dry laterite had the highest bulk density and contribution of organic carbon in the bulk-density transfer function was the largest.This research could provide some basic data and theoretical support for the ecological protection and restoration,and the estimation of soil carbon storage in the dry hot valley.