[Soil N/P ratio distribution characteristics of alpine grassland ecosystem in Qinghai-Tibet Plateau].
The distribution characteristics of soil N/P ratio in alpine grassland ecosystem of Qinghai-Tibet Plateau were surveyed by field investigation and laboratory analysis. Horizontally, soil N/ P ratio was generally higher in west and lower in east in a manner of staggered patch distribution, with higher N/P ratios mainly centralized in the hinterland of northern part of Tibet Plateau and in the lake basin area of the northern foot of Himalayas. Significant differences in soil N/P ratio were observed among grassland types and natural transects. Vertically, the distribution of N/P ratio along the soil profile from aboveground to underground among different grass types could be categorized into five patterns, including low-high-low-high, low-high-low, low-high, high-low-high-low, and high-low-high. The N/P ratio showed a significant positive correlation with soil bulk density at 0-20 cm depth, soil water content at 20-30 cm depth, contents of soil available K and total nitrogen, respectively. However, it showed significant negative correlation with soil bulk density at 20-30 cm depth, contents of soil available P and total P, respectively.
Jian-Lin
JL
Wang
Zhi-Ming
ZM
Zhong
Zhong-Hong
ZH
Wang
Bao-Xiong
BX
Chen
Xian-Zhou
XZ
Zhang
Zhen-Xi
ZX
Shen
Xing-Xiang
XX
Hu
Dacizhuoga
D002681:China; D065948:Grassland; D009584:Nitrogen / Q000032:analysis*; D010758:Phosphorus / Q000032:analysis*; D006109:Poaceae; D012987:Soil / Q000737:chemistry*
D012987:Soil; D010758:Phosphorus; D009584:Nitrogen