沈阳农业大学学报2016，Vol.47Issue(4)：418-424,7.DOI:10.3969/j.issn.1000-1700.2016.04.006
辽西北半干旱区典型人工林土壤C,N,P的垂直分布特征
The Vertical Distribution of Soil Carbon, Nitrogen and Phosphorus for Typical Plantations in the Semi-arid Areas of Northwest Liaoning
摘要
Abstract
The semi-arid area of Northwest Liaonin g, with fragile and sensitive ecological environment, is an important part of the Three-North Shelterbelt boundary protection zone, which plays an important role in the local ecological restoration and keeping the southern edge of Horqin sandy land from expanding. In order to quantify its characteristics and vertical distributions of soil organic carbon (SOC) and nutrients, this study selected the sample plots in three typical local artificial shelterbelt -Pinus sylvestris var. mongolica (Ps) plantation, Populus × euramericana (PX) plantation, Pinus sylvestris var. mongolica - Populus X euramericana mixed plantation (Ps-PX plantation) in the Fujia Forest Farm, Northwest Liaoning. Then, soil samples of these three typical plantations were tested for its organic carbon, nitrogen and phosphorus, and their vertical distribution characteristics were summarized, respectively. Results showed that the soil organic carbon and total nitrogen (TN) in the top-layer soil (0-10cm) were significantly different in the three plantations, constituting 2.86-9.04g•kg-1 and 0.35-0.78g•kg-1, respectively. The highest value was in Ps plantation, while the lowest value was in Ps-PX plantation. Soil total phosphorus (TP) contents were much lower with a range of 1.14-4.50mg•kg-1. The TP in Ps-PX plantation was significantly lower than those of both Ps plantation and PX plantation due to the local grazing behavior activities. On the vertical profile (0-50cm), SOC, TN and TP all decreased significantly with the increasing of soil depth (p﹤0.05). The SOC and TN in Ps plantation (46% and 33%) were significantly lower than those of PX plantation (52% and 47%) and Ps-PX plantation (62% and 49%). In summary, the three typical plantations take effects in increasing SOC, TN and TP in the top-layer soils, whereas P. sylvestris var. mongolica plantation played more obvious effects in the vertical soil profiles.关键词
半干旱区/人工防护林/土壤有机碳/土壤养分/土壤碳氮比Key words
semi-arid region/artificial shelterbelt/soil organic carbon/soil nutrient/soil C/N分类
农业科技引用本文复制引用
周永斌,郭鑫炜,魏亚伟,王茜,李吉,李志远,郑卓然..辽西北半干旱区典型人工林土壤C,N,P的垂直分布特征[J].沈阳农业大学学报,2016,47(4):418-424,7.基金项目
林业公益性行业科研专项项目(201404303-05) （201404303-05）
辽宁省科学技术计划-博士启动基金项目(20141063) （20141063）
