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酸角人工林不同坡位土壤有机碳及其活性组分的变化
王艳丹1,2, 何光熊1,2, 宋子波3, 张梦寅1,2, 杨淏舟1,2, 史亮涛1,2
1.云南省农业科学院热区生态农业研究所;2.元谋干热河谷植物园;3.云南猫哆哩集团食品有限责任公司
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。
关键词:  罗望子  坡位  土壤有机碳  垂直分布  乡土树种
DOI:10.13758/j.cnki.tr.2020.06.021
分类号:S153.6;S714.2
基金项目:云南省科技厅重点研发计划项目(2019BC001-02)和云南省科技计划项目农业联合青年项目(2017FG001(-099))资助。
Study on Soil Organic Carbon and Its Active Fractions at Different Slope Sites of Tamarindus indica Plantation
WANG Yandan1,2, HE Guangxiong1,2, SONG Zibo3, ZHANG Mengyin1,2, YANG Haozhou1,2, SHI Liangtao1,2
1.Institute of Tropical Eco-Agricultural Sciences, Yunnan Academy of Agricultural Sciences;2.Yuanmou Dry-Hot Valley Botanical Garden;3.Yunnan Maoduoli Group Food Co., Ltd.
Abstract:
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.
Key words:  Tamarindus indica  Slope position  Soil organic carbon  Vertical distribution  Native species

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