摘要
以鄂尔多斯沙地中的 4种主要啮齿动物小毛足鼠、三趾跳鼠、子午沙鼠和黑线仓鼠为对象 ,从能流和物质循环的角度对其在生态系统中的地位、作用及其经济意义进行了定量评价。这4种啮齿动物总摄入能为 2 .11× 10 6 kj/hm2 /a ,其中 15.12 %随粪、尿排出 ;对地上部分净初级生产量和植物种子的消费率分别为 5.6 5%和 6 8.14 % ;通过粪、尿及尸体分解向系统返回无机物和有机物分别为 16 .6kg/hm2 /a和 3.33kg/hm2 /a ;为下一营养级提供 1.91× 10 4 kj/hm2 /a。
The roles and economic significance of four rodents (Phodopus roborovskii, Dipus sagitta, Meriones meridianus and Crivetulus barabensis) inhabiting in Erdos sandland were evaluated from the point of energy flow and material cycle. The results obtained are as follows: (1) Total energy intake of the four populations was 2.11×10\+6 kj/hm\+2/a, among which 15.12% was discharged in the form of faeces and urine. (2) Consumption efficiency on the total aboveground net primary production and plant seeds was 5.56% and 68.14% respectively. (3) Inorganic matter and organic matter returned to ecosystem along with faeces, urine and dead body of the four rodent species were 16.6kg/hm\+2/a and 3.33kg/hm\+2/a respectively. (4) The rodents can also provided energy 1.91×10\+4 kj/hm\+2/a for the next tropic level.
出处
《中国草地》
CSCD
2000年第2期35-41,共7页
Grassland of China
