Open AccessClimatic and topographic variables control soil nitrogen, phosphorus, and nitrogen: Phosphorus ratios in a Picea schrenkiana forest of the Tianshan Mountains
Author(s) -
Zhonglin Xu,
Yong-Kui Chang,
Li Lü,
Qinghui Luo,
Zeyuan Xu,
Xiaofei Li,
Xuewei Qiao,
Xin Xu,
Xinni Song,
Yao Wang,
Yunxia Cao
Publication year - 2018
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0204130
Subject(s) - biogeochemical cycle , phosphorus , nutrient , nitrogen , arid , zoology , ecosystem , environmental science , precipitation , agronomy , chemistry , ecology , environmental chemistry , biology , geography , organic chemistry , meteorology
Knowledge about soil nitrogen (N) and phosphorus (P) concentrations, stocks, and stoichiometric ratios is crucial for understanding the biogeochemical cycles and ecosystem function in arid mountainous forests. However, the corresponding information is scarce, particularly in arid mountainous forests. To fill this gap, we investigated the depth and elevational patterns of the soil N and P concentrations and the N: P ratios in a Picea schrenkiana forest using data from soil profiles collected during 2012–2017. Our results showed that the soil N and P concentrations and the N: P ratios varied from 0.15 g kg −1 to 0.56 g kg −1 (average of 0.31 g kg −1 ), from 0.09 g kg −1 to 0.16 g kg −1 (average of 0.12 g kg −1 ), and from 2.42 g kg −1 to 4.36 g kg −1 (average of 3.42 g kg −1 ), respectively; additionally, values significantly and linearly decreased with soil depth. We did not observe a significant variation in the soil N and P concentrations and the N: P ratios with the elevational gradient. In contrast, our results revealed that the mean annual temperature and mean annual precipitation exhibited a more significant influence on the soil N and P concentrations and the N: P ratios than did elevation. This finding indicated that climatic variables might have a more direct impact on soil nutrient status than elevation. The observed relationship among the soil N and P concentrations and the N: P ratios demonstrated that the soil N was closely coupled with the soil P in the P . schrenkiana forest.