The model precision by the soil volumetric moisture content was relative lower.
土壤体积含水量表征土壤水分的模型精度相对要低。
Respiration rate and soil moisture are positively correlated when soil volumetric water content under 20% and negatively correlated when its content above 20%.
当土壤体积含水量低于20%时土壤呼吸速率与之成正相关；若超过20%后土壤呼吸速率与之成显著负相关。
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