呼伦贝尔荒漠草原不同放牧潜力下土壤-植物生态化学计量特征耦合关系分析  

Evaluation of Ecological Stoichiometry and Soil-Plant Coupling under Different Grazing Potentials in Hulun Buir Desert Steppe

作　　者：王百竹 朱媛君 杨晓晖[1] 图雅 山丹 萨拉 WANG Baizhu;ZHU Yuanjun;YANG Xiaohui;Tuya;Shandan;Sala(Institution of Desertification Studies/Institute of Ecological Conservation and Restoration,ChineseAcademy of Forestry,Beijing 100091,China;School of Soil and Water Conservation,Beijing ForestryUniversity,Beijing 100083,China;College of Agriculture and Forestry,Hulun Buir University,Hulun Buir 021008,China;Hulun Buir Forestry and Grassland Enterprise Development Center,HulunBuir 021008,China)

机构地区：[1]中国林业科学研究院荒漠化研究所/生态保护与修复研究所,北京100091 [2]北京林业大学水土保持学院,北京100083 [3]呼伦贝尔学院农林学院,内蒙古呼伦贝尔021008 [4]呼伦贝尔市林业和草原事业发展中心,内蒙古呼伦贝尔021008

出　　处：《中国草地学报》2023年第11期1-11,共11页Chinese Journal of Grassland

基　　金：国家自然科学基金面上项目(41971061);国家自然科学基金国际(地区)合作与交流项目(32061123005)。

摘　　要：以呼伦贝尔非地带性荒漠草原为研究区,分析了不同放牧潜力下植物-土壤生态化学计量变化特征及其耦合关系。结果表明:(1)土壤全磷、植物地上部分磷、氮含量以及植物地下部分氮含量随着放牧潜力的降低而显著增加,土壤碳磷比、氮磷比、植物地上部分碳氮比、碳磷比以及植物地下部分碳氮比变化趋势相反。(2)在高放牧潜力下,植物-土壤生态化学计量之间显著关系数量最少;在中放牧潜力下,植物-土壤生态化学计量特征之间显著关系数量最多;低放牧潜力下的植物生态化学计量特征仅与土壤有机碳及碳氮比的相关关系显著。综上,呼伦贝尔非地带性荒漠草原在中放牧潜力下,植物-土壤生态化学计量特征耦合关系相比于其他阶段最为显著;植物及土壤中的氮、磷元素含量在所有生态化学计量特征中最为关键,尤其是植物根系与土壤生态化学计量特征具有较强的协变关系。This study aimed to investigate the ecological stoichiometry characteristics of plant-soil interactions and their coupling under different grazing potentials in the non-zonal desert steppe of Hulun Buir.The results showed that:(1)As grazing potential decreased,soil total phosphorus phosphorus content and nitrogen content increased significantly in above-ground and below-ground plant parts.Conversely,soil carbon phosphorus ratio and nitrogen phosphorus ratio,as well as the carbon nitrogen ratio and carbon phosphorus ratio in above-ground plant parts,along with the carbon nitrogen ratio in below-ground plant parts,exhibited opposite trends.(2)The highest number of significant plant-soil ecological stoichiometry relationships was observed at moderate grazing potential,with the least significant relationships at high grazing potential.In contrast,at the low grazing potential,plant ecological stoichiometry characteristics were only significantly correlated with soil organic carbon content and carbon nitrogen ratio.This study highlighted that the coupling of plant-soil ecological stoichiometry in the non-zonal desert steppe of Hulunbuir was the most pronounced at the moderate grazing potential compared to other levels.Additionally,nitrogen and phosphorus content in both plants and soils were critical elements in these ecological stoichiometry features,particularly the strong covariance observed between plant roots and soil ecological stoichiometry characteristics.

关 键 词：非地带性荒漠草原 草原放牧潜力 生态化学计量 草原健康性 土壤元素 

分 类 号：S812.2[农业科学—草业科学]