The density and biomass of soil animal has a positive interrelation to the present content of the fallen, the content of organic substance in soil and vegetation coverage.
土壤动物密度及生物量与调落物年归还量、土壤有机质含量、植被盖度等均呈正相关关系；
Changes in density of red blood cells (RBCs) during in vivo aging were studied using an animal model developed with the method of antibody inducement of acute RBC lysis.
作者在用抗体诱发动物急性溶血的方法建立的红细胞在体衰老模型的基础上，对红细胞衰老过程中的细胞密度变化进行了研究。
The social and economic characteristics in pastoral area are small population density and great contradiction between forestry and animal husbandry.
牧区（风沙区）具有人口密度小，林牧矛盾突出的特点。
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