摘要
在野外采集酸角林下0~20 cm和20~40 cm土壤,分析不同坡位(坡顶、坡中和坡脚)对酸角林土壤有机碳(SOC)、易氧化有机碳(ROC)、颗粒有机碳(POC)和可溶性有机碳(DOC)的影响。研究结果表明:①酸角林的坡顶SOC富集,坡中SOC最低;坡顶和坡中的SOC主要在土壤表层(0~20 cm)出现富集现象;②ROC、POC、DOC含量变化与SOC含量变化相似,ROC、POC、DOC含量与SOC含量呈极显著的正相关(P<0.01);③ROC占SOC的比例范围为33.11%~47.00%,DOC占SOC的比例范围为1.27%~1.89%,POC占SOC的比例范围为20.10%~26.51%;④坡脚土壤碳库的稳定性最好,易于积累有机碳。在元江干热河谷中种植乡土树种——酸角,对SOC产生了有益影响,促进了该区域SOC的库效益。
Soil samples were collected from 0–20 and 20–40 cm depths in different slope sites(top of slope,middle of slope,and foot of slope)of Tamarindus indica plantation to analyze the variations of soil organic carbon(SOC),readily oxidizable carbon(ROC),particulate organic carbon(POC)and dissolved organic carbon(DOC).The results showed that SOC of Tamarindus indica plantation was the highest at top of slope and the lowest at foot of slope.SOC was enriched in topsoil(0–20 cm)at top and middle of slope,ROC,POC and DOC contents changed similarly as SOC,and there were extremely significant positive correlations between SOC and active soil organic carbon of ROC,POC and DOC(P<0.01).The proportions of ROC,DOC and POC in SOC were 33.11%–47.00%,1.27%–1.89%,and 20.10%–26.51%,respectively.Soil carbon at the foot of slope was the most stable,which is benefit to organic carbon accumulation.Thus,planting Tamarindus indica,a native tree species,in the dry and hot valley of Yuanjiang has a beneficial effect on SOC accumulation,it can promote the function of soil as organic carbon pool in this area.
作者
王艳丹
何光熊
宋子波
张梦寅
杨淏舟
史亮涛
WANG Yandan;HE Guangxiong;SONG Zibo;ZHANG Mengyin;YANG Haozhou;SHI Liangtao(Institute of Tropical Eco-Agricultural Sciences,Yunnan Academy of Agricultural Sciences,Yuanmou,Yunnan 651399,China;Yuanmou Dry-Hot Valley Botanical Garden,Yuanmou,Yunnan 651399,China;Yunnan Maoduoli Group Food Co.,Ltd.,Yuxi,Yunnan 659288,China)
出处
《土壤》
CAS
CSCD
北大核心
2020年第6期1256-1262,共7页
Soils
基金
云南省科技厅重点研发计划项目(2019BC001-02)
云南省科技计划项目农业联合青年项目(2017FG001(-099))资助。
关键词
罗望子
坡位
土壤有机碳
垂直分布
乡土树种
Tamarindus indica
Slope position
Soil organic carbon
Vertical distribution
Native species
