生态环境学报Issue(7)：1113-1120,8.
黄河下游灌区土壤碳储量及碳密度分布
Storage and Spatial Distribution of Soils Carbon in Lower Reaches of the Yellow River Irrigation District
摘要
Abstract
Soil carbon, particularly the organic form (SOC), exerts an important role in crop production and the mitigation of greenhouse gas emissions. So a better understanding of SOC storage and the variability in SOC distribution will contribute a lot to sustainable development of regional ecological environments and agriculture. As an important grain and cotton production base, the Yellow River irrigated district has irrigation history of more than 50 years, and there is no doubt that long-term irrigation has changed in regional soil C storage and distribution. Previous study on soil C estimates are more conducted in larger scale, and the results often appear quite different due to the amount of sampling and the complexity of the regional variation in environmental factors, moreover there are less studies concerning to long-term influence of large-scale irrigation on soil C distribution, particularly in the lower Yellow River irrigated district. In this study, we collected relevant statistical data, soil and hydrological data and so on, taken samples from 7 layers of soil with a depth of 1 m (0~5 cm、5~10 cm、10~20 cm、20~40 cm、40~60 cm、60~80 cm、80~100 cm), using GIS spatial interpolation and spatial statistical methods, aimed at generalizing C storage and soil carbon density (CD) distribution characteristics in different depth or under different land uses and different soil types, so as to providing the basis for the development of ecological agriculture under long-term irrigation conditions in the study area. The study results are as follows:total carbon storage (TC) to 1 m soil depth was 1 045.13 Tg, and soil organic carbon storage (SOC) amounted to 815.76 Tg, with proportions of 23.44%, 20.06%, 18.95%, 18.83%, and18.72%held at soil depths of 0~20 cm, 20~40 cm, 40~60 cm, 60~80 cm, and 80~100 cm respectively. Estimated SOC in cultivated and uncultivated lands were approximately 610 Tg and 18.99 Tg respectively, while grassland and forested land held just 25.97 Tg and 16.41 Tg respectively. C storage in different depth layer changes slightly under the same or different land uses, mainly due to human activities, vegetation litter inputs and influence of groundwater environment. Among different kinds of soil type, semi~hydromorphic soils accounted for the largest proportion (about 77.82%) of total storage, while entisoils accounted for the smallest (about 5.49%). Average total carbon density (TCD) was (19.37±1.48) kg·m-2 to 1 m depth, while average soil organic carbon density (SCD) was (15.12±1.14) kg·m-2, and ranged from (16±1.15) kg·m-2in forested land to (14.98±0.91) kg·m-2 in waste land. As to different kinds of soil type, SCD ranged from (14.76±0.81) kg·m-2 of saline-alkali soil to (15.22±1.01) kg·m-2of semi-luvisols. The SCD of different soil types was largely affected by formation environment and formation process of soil which was determined by Yellow River silt deposition and surface and groundwater circulation. Average SCD was higher than both the national average (9.60 kg·m-2) for China and the planet as a whole (10.6 kg·m-2). However, SCD vertical variability was less apparent compared to other geographical regions.关键词
碳储量/碳密度/引黄灌区/土地利用/土壤类型Key words
carbon storage/carbon density/yellow river irrigated district/land use/soil type分类
农业科技引用本文复制引用
赵广帅,李运生,高静,李发东..黄河下游灌区土壤碳储量及碳密度分布[J].生态环境学报,2014,(7):1113-1120,8.基金项目
中国科学院“百人计划”项目；中国科学院战略性先导科技专项（XDA05050502）；国家科技支撑课题 （）
