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首页> 美国卫生研究院文献>other >Climatic and topographic variables control soil nitrogen phosphorus and nitrogen: Phosphorus ratios in a Picea schrenkiana forest of the Tianshan Mountains
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Climatic and topographic variables control soil nitrogen phosphorus and nitrogen: Phosphorus ratios in a Picea schrenkiana forest of the Tianshan Mountains

机译：气候和地形变量控制天山云杉云杉林中的土壤氮磷和氮：磷比率

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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.
机译：了解土壤氮（N）和磷（P）的浓度，储量和化学计量比对于了解干旱山区森林的生物地球化学循环和生态系统功能至关重要。但是，相应的信息很少，特别是在干旱的山区森林中。为了填补这一空白，我们使用2012-2017年土壤剖面数据调查了云杉云杉林中土壤N和P浓度的深度和海拔格局以及N：P比率。我们的结果表明，土壤中的氮和磷浓度以及氮磷比从0.15 g kg -1 到0.56 g kg -1 （平均0.31 g kg < sup> -1 ），从0.09 g kg -1 到0.16 g kg -1 （平均0.12 g kg -1 >），分别从2.42 g kg -1 到4.36 g kg -1 （平均值为3.42 g kg -1 ）；此外，值随土壤深度显着线性下降。我们没有观察到土壤N和P浓度以及N：P比率随海拔梯度的显着变化。相反，我们的结果表明，年平均气温和年平均降水量对土壤氮和磷的浓度以及氮磷比的影响比海拔高得多。这一发现表明，气候变化对土壤养分状况的影响可能比海拔变化更为直接。观察到的土壤氮和磷浓度与氮磷比之间的关系表明，土壤氮与雪松森林中的磷紧密相关。

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