崩岗侵蚀坡地桉树林种植对土壤有机碳库的影响
收稿日期: 2023-09-04
修回日期: 2023-11-22
网络出版日期: 2024-02-21
基金资助
广东省基础与应用基础研究基金“粤北土壤环境野外科学观测研究站”(2019B121201004);国家自然科学基金项目(41977010)
Effects of Eucalyptus Afforestationon the Soil Organic Carbon Pool on the Hillslope of in the Red Soil Collapsing Erosion Area
Received date: 2023-09-04
Revised date: 2023-11-22
Online published: 2024-02-21
揭示花岗岩红壤崩岗发育区桉树(Eucalyptus spp.)林种植后土壤有机碳库变化过程,对全面理解与评价桉树人工林水土保持效益具有重要意义。在广东省五华县选择立地条件相近的8 a(位于中等侵蚀区)和13 a(位于强侵蚀和弱侵蚀区)桉树林样地作为研究对象,以附近裸地、次生马尾松林为对照,对各样地坡上、坡中和坡下位置0~<2 cm,2~<10 cm,10~<20 cm,20~<30 cm,30~<50 cm,50~100 cm共6个深度的土壤有机碳含量进行比较分析。结果表明:崩岗侵蚀区桉树林0~30 cm土壤有机碳含量均高于对照裸地,弱侵蚀区坡下部位高于天然次生林,说明桉树林对红壤崩岗侵蚀区坡面有机碳恢复作用主要体现在表层土壤。此外,3个不同林龄的桉树林样地不同坡位土壤有机碳储量为1.67~4.65 kg/m2,弱侵蚀区13 a桉树林所有坡位土壤碳储量均高于裸地,强侵蚀区坡中、中等侵蚀区坡上土壤碳储量低于裸地,但两者坡下位置土壤碳储量接近天然次生林。桉树林在弱侵蚀区或者坡下位置具有较好的土壤有机碳恢复效果,而在中等或强侵蚀区的坡上或坡中位置,恢复效果需要更长年限(>13 a)来验证。在红壤崩岗侵蚀区植被恢复治理过程中,需要综合考虑侵蚀强度、坡面位置等因素来选择恢复植被。
刘雪健 , 张志华 , 郝贝贝 , 王楠 , 马宇 , 贺斌 , 张思毅 . 崩岗侵蚀坡地桉树林种植对土壤有机碳库的影响[J]. 林草资源研究, 2023 , 0(6) : 75 -81 . DOI: 10.13466/j.cnki.lczyyj.2023.06.009
Studying the recovery process of soil organic carbon after the Eucalyptus planting provide scientific basis for comprehensive evaluation of soil and water conservation benefit of Eucalyptus afforestation in the red soil collapsing erosion area.Several Eucalyptus afforestation sample plots with similar site conditions but different recovery years,and various slope positions in Wuhua County,Guangdong Province,China were selected as the study area.A comparative analysis was conducted on characteristics of the soil organic carbon pool at different depths with nearby bare land and secondary Pinus massoniana as controls.The soil organic carbon (SOC)of Eucalyptus afforestation was higher than that of bare land at the depths of 0-30 cm,and the lower slope was even high than the natural Pinus massoniana in the collapsing erosion area.This meant that the effects of Eucalyptus afforestation on the recovery of SOC were mainly reflected in the surface soils.In addition,the SOC in the Eucalyptus afforestation ranged from 1.67 kg/m2 to 4.65 kg/m2,and the SOC of all slope positions in the light erosion area was higher than that of the bare land (1.91 kg/m2).However,the SOC of the middle slope in the heavy erosion areas and upper slope in the moderate erosion areas were lower than that of the bare land,and the SOC in the lower slope of both areas was close to natural forest.The Eucalyptus afforestation has good recovery effects of soil organic carbon in the light erosion zone or the lower slope,but at the upper or middle slope in moderate and heavy erosion areas,the recovery effects needs to be clarified in longer duration.Therefore,this study highlights that it is necessary to consider the factors of erosion intensity and slope position before selecting the afforestation plants during the process of vegetation restoration in the red soil collapsing erosion area.
Key words： soil organic carbon; Eucalyptus forest; soil erosion; collapsing slope; red soil
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