Abstract: In this study， we obtained vegetation and soil data through on-site field sampling surveys. Using trade-off analysis and relative contribution analysis to examine the coupling relationship between the two under the three utilization modes of enclosure， cutting， and grazing. The results were as follows. Under grazing conditions， soil water content （SWC） was significantly higher than that of enclosure （P<0.05）， cutting was intermediate between the two. The soil organic carbon content （SOC） of the 10-20 cm soil layer was also significantly higher than enclosure （P<0.05）. Research had found a significant interactive relationship between SWC and SOC. The mutual explanation rates of soil SWC and SOC in enclosure and cutting plots were higher， at 69% and 77% respectively， while grazing reduced to 33%. And grazing had changed the bias of the trade-off relationship. Vegetation factors and soil particle composition （especially silt content） were important driving factors leading to this change. This study reveals that the utilization method profoundly affects the carbon-water coupling balance by regulating vegetation and soil conditions， providing a scientific basis for formulating adaptive management strategies for temperate meadow grasslands based on carbon balance. However， since it is a single sampling， the long-term effects still need to be further studied in combination with climate fluctuations and other dactors.

Key words: Temperate meadow grassland, Soil organic carbon content, Soil water content, Trade-off analysis, Utilization modes

摘要： 本研究采用实地取样调查的方式获得植被和土壤数据，使用权衡分析和相对贡献分析在围封、刈割与放牧三种利用方式下，两者的耦合关系，结果如下：放牧条件下土壤含水量（Soil water content， SWC）整体显著高于围封（P<0.05），刈割介于两者之间，并且10~20 cm土层的土壤有机碳含量（Soil organic carbon content， SOC）也显著高于围封（P<0.05）。SWC与SOC存在显著互作关系，围封和刈割样地土壤SWC和SOC的相互解释率更高，分别为69%和77%，放牧则减弱至33%，并且放牧改变了权衡关系的偏向。植被因素与土壤颗粒组成（尤其是粉粒含量）是导致该变化的重要驱动因素。本研究揭示了利用方式通过调控植被和土壤条件，深刻影响碳水耦合平衡，为制定基于碳水平衡的温性草甸草原适应性管理策略提供了科学依据。但由于为单次采样，对于长期效应还需结合气候波动等因素进一步研究。

关键词: 温性草甸草原, 土壤有机碳含量, 土壤含水量, 权衡分析, 利用方式