柠条人工林下草本植被特征与土壤特性相关性研究

Relationship between Herbaceous Vegetation Characteristics and Soil Characteristics under Caragana Plantation

为探索黄土丘陵沟壑区最佳的柠条(Caragana Korshinskii)平茬措施,本研究以该区柠条人工林为研究对象,对其进行4种不同方式的平茬措施,分析在不同平茬措施的柠条林下草本植被特征与土壤特性的相关关系。结果表明:隔行平茬措施下草本生物量最大,柠条林下各土层土壤含水量与草本地上生物量密切相关,且以负相关关系为主;草本植物多样性各指数均与土壤含水量呈负相关关系,40~80 cm土层的土壤含水量与Simpson指数的相关性显著(P<0.05),与Shannon-wiener指数的相关性极显著(P<0.01);土壤养分各指标与草本植物多样性没有显著相关性,在0~60 cm土层内,土壤碱性越大,草本生物量越大,20~40 cm土层土壤有机质越小,草本生物量越大。综合以上结果,在该区域采取柠条隔行平茬措施最佳。

In order to explore the best stubble measure of Caragana korshinskii in the Loess Hilly and Gully Region,four different stubble measures was applied on Caragana korshinskii,and analyzed the correlation between herb vegetation characteristics and soil characteristics.The results showed that the herb biomass was the largest under the interlaced stubble,and the soil moisture content in the various soil layers under the Caragana korshinskii forest was mainly negatively related to the above-ground biomass of the herb.;The diversity of herb plants was negatively related to the soil moisture.The soil moisture content in the 40~80 cm soil layer is significantly correlated with the Simpson index(P<0.05),and the correlation with the Shannon-wiener index is extremely significant(P<0.01);There is no significant correlation between the soil nutrient indexes and herbaceous plants diversity.In the 0~60 cm soil layer,the greater the soil alkalinity,the larger the herb biomass;and the smaller the soil organic matter in the 20~40 cm soil layer,the greater the herb biomass.Based on the above results,it is considered that interlaced stubble is the best suitable measure for Caragana in this area.