三江源地区土壤碳库的初步研究

对三江源地区原生植被、轻度、重度和极度退化的土壤碳素含量的研究分析表明：土壤碳素含量随着土层的加深都表现为逐渐减少,变化幅度分别为72.22-46.93 mg/kg,64.73-15.95 mg/kg,19.03-14.10mg/kg,17.92-10.96 mg/kg;随着海拔的降低也都表现为逐渐减少,变化幅度分别为32.02-15.66 mg/kg,21.11-12.88 mg/kg,10.73-8.54 mg/kg,10.56-8.35 mg/kg;玉树和果洛地区的土壤碳素含量都随着草地退化程度的加剧表现为逐渐降低,变化幅度分别为34.82-12.88 mg/kg,11.77-5.19 mg/kg,并且玉树地区比果洛地区土壤碳素含量高。

The Research on C Store of Soil in Source Area of Lantsang, Yellow and Yangtse River

Through research on the C contents of undegradation, light, heavy and extreme degradation soil in source area of Lantsang, Yellow and Yangtse River. The result indicated that in different soil layer, with its depth increase, the contents of C decrease, and change extent are 72.22-46.93 mg/ kg, 64. 73-15. 95 mg/kg, 19. 03-14.10 mg/kg, 17. 92-10. 96 mg/kg, respectively; with altitude decrease, the contents of C decrease, and change extent are 32.02-15.66 mg/kg,21.11-12.88 mg/ kg,10.73-8.54 mg/kg, 10.56-8.35 mg/kg, respectively; with the degree of degradation increase, the C contents of Yushu and Guoluo reduce, and change extent are 34.82- 12. 88 mg/kg, 11.77 5.19 mg/kg, respectively; Yushu area is higher than Guoluo area in the content of C.