Effects of Eucalyptus Afforestationon the Soil Organic Carbon Pool on the Hillslope of in the Red Soil Collapsing Erosion Area

doi:10.13466/j.cnki.lczyyj.2023.06.009

Abstract

Abstract:

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

CLC Number:

S714

LIU Xuejian, ZHANG Zhihua, HAO Beibei, WANG Nan, MA Yu, HE Bin, ZHANG Siyi. Effects of Eucalyptus Afforestationon the Soil Organic Carbon Pool on the Hillslope of in the Red Soil Collapsing Erosion Area[J]. Forest and Grassland Resources Research, 2023, (6): 75-81.

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样地	坡位	桉树				林下植被
样地	坡位	密度/ hm²	树高/ m	胸径/ cm	郁闭度/ %	主要物种	植被高度/ cm	盖度/ %
次生马尾松林		890	6.8±1.2a	8.7±1.8a	45	芒萁[Dicranopteris dichotoma(Thunb.)Bernh.]	73	85
1号样地	坡上	1 636	17.2±0.3b	7.9±0.6a	75	芒萁	89	80
	坡中	1 855	18.6±0.5c	10.8±0.9b	85	芒萁	122	90
	坡下	1 685	18.9±0.2c	12.1±0.5b	90	芒萁	150	95
2号样地	坡上	1 320	17.4±0.6b	5.3±2.1a	50	芒(Miscanthus sinensis)	12	2
	坡中	1 516	17.6±0.3b	7.5±1.1a	55	芒	33	10
	坡下	1 532	17.3±0.7c	9.2±1.9ab	80	芒	75	15
3号样地	坡上	1 730	18.3±0.5c	7.2±1.6a	80	百喜草(Paspalum natatu)	13	7.5
	坡中	1 832	18.8±0.4c	9.9±0.8b	85	百喜草	22	12
	坡下	1 868	18.9±0.3c	11.6±1.0b	90	百喜草	35	50
裸地

	0~<2 cm	2~<10 cm	10~<20 cm	20~<30 cm	30~<50 cm	50~100 cm
0~100 cm	0.898^**	0.847^**	0.920^**	0.792^**	0.575	0.635^*
0~<50 cm	0.959^**	0.912^**	0.963^**	0.835^**	0.481	0.402