Enclosing plays a crucial role in vegetation and soil quality in grassland. The biomass of green plants, litter, and vertical distributions of soil physical properties and nutrient stocks were evaluated at plot enclosed long term for 38 years inside a fence and a long-term grazing plot outside a fence in a semi-arid grassland of Inner Mongolia. The results showed that dry matter of green plants and litter during the 38-year enclosing treatment was higher than in the grazing treatment (p < 0.01). The soil silt (2–50 μm) in the 38-year enclosing treatment was 5.9% higher than in the grazing treatment (p < 0.01) in 0–10 cm soil, and the fine sand (100–250 μm) was 6.0% lower (p < 0.05). The 38-year enclosing treatment slightly decreased the bulk density and significantly decreased the electrical conductivity in each soil layer (0–100 cm). The 38-year enclosing treatment significantly increased the stocks of soil organic carbon (SOC), available phosphorus (AP), and available potassium (AK) on the surface soil, and obviously decreased the stocks of total nitrogen (TN), total phosphorus (TP), calcium (Ca), magnesium (Mg), sulfur (S), and available nitrogen (AN) in each soil layer (0–100 cm). In conclusion, long-term enclosing improved grassland production, but decreased most nutrient stocks in soil.

中文翻译：

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长期圈地对内蒙古草原土壤物理性质和养分储量垂直分布的影响

围护对草地植被和土壤质量起着至关重要的作用。在内蒙古半干旱草原围栏内长期围封38年样地和围栏外长期放牧小区的绿色植物生物量、凋落物、土壤物理性质和养分储量的垂直分布评价. 结果表明，38年封闭处理绿植和凋落物干物质均高于放牧处理（p < 0.01）。在0-10 cm土壤中，38年封闭处理的土壤粉砂（2-50 μm）比放牧处理高5.9%（p < 0.01），细砂（100-250 μm）为6.0%下 ( p< 0.05)。38 年的封闭处理略微降低了每个土层（0-100 cm）的容重和显着降低的电导率。38年的封闭处理显着增加了表层土壤有机碳（SOC）、速效磷（AP）和速效钾（AK）的储量，显着降低了全氮（TN）、全磷（ TP)、钙 (Ca)、镁 (Mg)、硫 (S) 和每个土壤层 (0–100 cm) 中的有效氮 (AN)。总之，长期封闭提高了草地产量，但减少了土壤中的大部分养分储备。