Deep Soil C, N, and P Stocks and Stoichiometry in Response to Land Use Patterns in the Loess Hilly Region of China.
Deep Soil C, N, and P Stocks and Stoichiometry in Response to Land Use Patterns in the Loess Hilly Region of China.
复制标题
中国黄土丘陵区深层土壤碳、氮、磷库及化学计量对土地利用格局的响应
DOI：
10.1371/journal.pone.0159075
复制
发表时间：
2016
期刊：
影响因子：
3.7
通讯作者：
Ren G
中科院分区：
文献类型：
--
作者：
Li C;Zhao L;Sun P;Zhao F;Kang D;Yang G;Han X;Feng Y;Ren G
在黄土丘陵区，退耕还林（草）导致土壤表层有机碳（C）、氮（N）和磷（P）储量的显著增加。然而，关于深层土壤中C、N和P的变化的知识仍然有限。为了阐明深层土壤C，N，P股票和化学计量响应土地利用变化的反应，从0-200厘米的土壤剖面收集以下三个典型的土地利用模式在该地区的中心地带：林地，草地，耕地。与农田相比，林地和草地提高了土壤有机碳和全氮的含量，降低了全磷的含量。在0-200 cm土层，林地和草地土壤有机碳累积储量分别提高了34.97%和7.61%，全氮累积储量分别提高了54.54%和12.47%。林地土壤有机碳、全氮、全磷含量和储量几乎在所有土层均高于草地。100-200 cm土层的土壤有机碳、全氮和全磷储量百分比最高，分别为47.80%~ 49.93%、46.08%~ 50.05%和49.09%~ 52.98%。林地和草地土壤C：P、N：P和C：N：P比值均高于草地，林地土壤C：P、N：P和C：N：P比值高于草地。土壤有机碳和全氮储量对土壤C：N、C：P和N：P比值有显著影响。因此，造林是退化土地土壤养分恢复的最佳选择，深层土壤为评价土壤C、N、P库和循环提供了极为重要的资源。
In the Loess Hilly Region of China, the widespread conversion of cropland to forestland and grassland has resulted in great increased in organic carbon (C), nitrogen (N) and phosphorus (P) stocks in the shallow soil layers. However, knowledge regarding changes in C, N, and P in deep soil is still limited. To elucidate the responses of deep soil C, N, and P stocks and stoichiometry in response to changes in land use, the soil from a 0–200 cm soil profile was collected from the following three typical land use patterns in the heartland of the region: forestland, grassland, and cropland. Compared with cropland, forestland and grassland had improved soil organic carbon (SOC) and total nitrogen (TN) contents and stocks at most soil depths but decreased total phosphorus (TP) contents and stocks. At soil depths of 0–200 cm in the forestland and grassland, the cumulative SOC stocks were improved by 34.97% and 7.61%, respectively, and the TN stocks were improved by 54.54% and 12.47%, respectively. The forestland had higher SOC, TN and TP contents and stocks compared to the grassland in almost all soil layers. The soil depths of 100–200 cm contained the highest percentages of SOC, TN and TP stocks (47.80%–49.93%, 46.08%–50.05% and 49.09%–52.98%, respectively). Additionally, the forestland and grassland showed enhanced soil C:P, N:P and C:N:P ratios, and the forestland had higher C:P, N:P and C:N:P ratios compared to the grassland. Furthermore, the SOC and TN stocks had significant impacts on the soil C:N, C:P and N:P ratios. It was concluded that afforestation was the best choice for soil nutrient restoration of degraded land, and deep soil provided an extremely important resource for evaluating soil C, N and P pools and cycling.