内蒙古典型草原放牧生态系统硫循环模式的初步研究  

The S Cycling in Inner Mongolia Steppe Grazed by Sheep

作　　者：汪诗平[1] 王艳芬[1] 姚依群[1] 

机构地区：[1]中国科学院植物研究所,内蒙古草原生态系统定位研究站,北京100093

出　　处：《草地学报》1998年第4期252-257,共6页Acta Agrestia Sinica

基　　金：国家自然科学基金;重大基金!49790020

摘　　要：通过对硫在各分室中的分布及其生物循环规律的研究。结果表明，95．6％的硫元素贮存于土壤中，是其主要的贮存库和流通枢纽，而植物中全硫含量只占整个放牧系统的4％左右，其中在植物亚系统中，93．7％的硫累积在根中。在硫的生物循环过程中，其循环速率为0．40，而绵羊通过粪尿归还的硫量是植物凋落物归还量的6倍，放牧加大了硫的归还量，但对硫的生物循环速率影响不大。在未考虑土壤淋落的情况下，该系统的输入校输出多4．89kg／hm2a，因此系统硫的平衡状况如何，则视土壤淋溶量而定，淋溶过程的研究将是物质循环和营养平衡状况的关键问题。The experiment was conducted in Inner Mongolia Grassland Ecosystem Research Station.The stocking rate was 4. o sheep/hm2 within 1 hm2 pasture fenced in 113 days(warm seasons). The resultsshowed that the amount of S at the top of 0～30cm soil and in plant subsystem were 95. 6 % and 4 % in thewhole grazing system,respectively. The soil was a great amount of S pool. The 93. 7% of total S was accu-mulated in roots in the plant subsystem. The rate of S biological cycling was about 0. 40 in the grazingsheep system. The amount of S through fences and urinary return was as 6 times as through litter decom-position,therefore grazing sheep speeded up S return,but no influence on S biological cycling rate was ob-served because the intake S by 4 sheep was only 0. 4% of the whole graizing system. The input of S fromrainfall was 6. 51kg/hm2/a in 1995,and S removal in animal products and in excretion which removed tocamping area was 0. 63kg/hm2 during warm season (113 days). The S status was positive balance about4. 89kg/hm2/a for warm season pasture without considering leaching and other lost.

关 键 词：内蒙古 草原 典型草原 硫 分布 生物循环 土壤 

分 类 号：S812.2[农业科学—草业科学]