The effect of grazing on the grassland under woods is relatively great, along with the increase of grazing intensity, soil rigidity, soil capacity, and the nutrient element of N, P, K all decreasing accordingly.
随着放牧强度的增加，防护林草地硬度、容重增加，土壤有机质和土壤N、P、K营养元素含量降低。
参考来源 - 农牧交错区乡村生态研究The cortex of bark was consist of 9-12 layer nutrient element parenchyma so its mechanical capability have influence on the resistance to the disease.
山核桃树皮的皮层均由9-12层富含营养物质的薄壁细胞组成，其机械性能在一定程度上影响着树皮对溃疡病抗性。
参考来源 - 山核桃抗溃疡病机理及其相关因素的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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