Vegetation restoration has been proposed as an effective method for increasing both plant biomass and soil carbon(C) stocks. In this study, 204 publications(733 observations) were analyzed, focusing on the effects of ...Vegetation restoration has been proposed as an effective method for increasing both plant biomass and soil carbon(C) stocks. In this study, 204 publications(733 observations) were analyzed, focusing on the effects of vegetation restoration on soil organic carbon(SOC) in China. The results showed that SOC was increased by 45.33%, 24.43%, 30.29% and 27.98% at soil depths of 0–20 cm, 20–40 cm, 40–60 cm and > 60 cm after vegetation restoration, respectively. Restoration from both cropland and non-cropland increased the SOC content. The conversion of non-cropland was more efficient in SOC accumulation than the conversion of cropland did, especially in > 40 cm layers. In addition, the conversion to planted forest led to greater SOC accumulation than that to other land use did. Conversion period and initial SOC content extended more influence on soil C accumulation as the main factors after vegetation restoration than temperature and precipitation did. The SOC content significantly increased with restoration period after long-term vegetation restoration(> 40 yr), indicating a large potential for further accumulation of carbon in the soil, which could mitigate climate change in the near future.展开更多
Artificial vegetation restoration is the main measure for vegetation restoration and soil and water conservation in alpine mine dumps on the Qinghai-Tibet Plateau,China.However,there are few reports on the dynamic cha...Artificial vegetation restoration is the main measure for vegetation restoration and soil and water conservation in alpine mine dumps on the Qinghai-Tibet Plateau,China.However,there are few reports on the dynamic changes and the influencing factors of the soil reinforcement effect of plant species after artificial vegetation restoration under different recovery periods.We selected dump areas of the Delni Copper Mine in Qinghai Province,China to study the relationship between the shear strength and the peak displacement of the root-soil composite on the slope during the recovery period,and the influence of the root traits and soil physical properties on the shear resistance characteristics of the root-soil composite via in situ direct shear tests.The results indicate that the shear strength and peak displacement of the rooted soil initially decreased and then increased with the increase of the recovery period.The shear strength of the rooted soil and the recovery period exhibited a quadratic function relationship.There is no significant function relationship between the peak displacement and the recovery period.Significant positive correlations(P<0.05)exists between the shear strength of the root-soil composite and the root biomass density,root volume density,and root area ratio,and they show significant linear correlations(P<0.05).There are no significant correlations(P>0.05)between the shear strength of the root-soil composite and the root length density,and the root volume ratio of the coarse roots to the fine roots.A significant negative linear correlation(P<0.05)exists between the peak displacement of the rooted soil and the coarse-grain content,but no significant correlations(P>0.05)with the root traits,other soil physical property indices(the moisture content and dry density of the soil),and slope gradient.The coarse-grain content is the main factor controlling the peak displacement of the rooted soil.展开更多
[目的]对比分析花岗岩侵蚀区不同水土流失治理年限的植物物种组成、群落结构及其多样性差异,为花岗岩侵蚀区水土流失治理和生态重建工作提供科学依据。[方法]采用空间代替时间的方法,在江西省兴国县平江流域花岗岩侵蚀区,选择治理4 a, 1...[目的]对比分析花岗岩侵蚀区不同水土流失治理年限的植物物种组成、群落结构及其多样性差异,为花岗岩侵蚀区水土流失治理和生态重建工作提供科学依据。[方法]采用空间代替时间的方法,在江西省兴国县平江流域花岗岩侵蚀区,选择治理4 a, 14 a, 24 a, 34 a的4个不同治理年限人工林为研究对象,以未人为治理林地和次生林作为对照,采用样方调查法,调查分析不同林地植物群落的物种组成、群落结构及植物多样性。[结果](1)共调查植物43种,隶属于31科41属,其中乔木层17种,灌木层8种,草本层18种。(2)“竹节沟+乔灌草”措施能够有效增加植物多样性,促进植被恢复与演替,不同治理年限林地的辛普森指数和香农—威纳指数均大于未人为治理林地。(3)随着水土流失治理年限的增加,植物群落的辛普森指数、香农—威纳指数和均匀度指数均呈上升—下降—上升的趋势,且均小于次生林。(4)不同治理年限林地、次生林和未人为治理林地之间的共有物种较少,整体上表现为不相似。[结论]仅靠自然封禁难以有效恢复花岗岩侵蚀区的植物多样性,“竹节沟+乔灌草”措施能有效促进植被恢复,提升植物多样性。展开更多
基金Under the auspices of Strategic Priority Research Program of Chinese Academy of Sciences(No.XDA05060104)
文摘Vegetation restoration has been proposed as an effective method for increasing both plant biomass and soil carbon(C) stocks. In this study, 204 publications(733 observations) were analyzed, focusing on the effects of vegetation restoration on soil organic carbon(SOC) in China. The results showed that SOC was increased by 45.33%, 24.43%, 30.29% and 27.98% at soil depths of 0–20 cm, 20–40 cm, 40–60 cm and > 60 cm after vegetation restoration, respectively. Restoration from both cropland and non-cropland increased the SOC content. The conversion of non-cropland was more efficient in SOC accumulation than the conversion of cropland did, especially in > 40 cm layers. In addition, the conversion to planted forest led to greater SOC accumulation than that to other land use did. Conversion period and initial SOC content extended more influence on soil C accumulation as the main factors after vegetation restoration than temperature and precipitation did. The SOC content significantly increased with restoration period after long-term vegetation restoration(> 40 yr), indicating a large potential for further accumulation of carbon in the soil, which could mitigate climate change in the near future.
基金supported by the Project of Qinghai Science&Technology Department(Grant No.2021-ZJ-956Q).
文摘Artificial vegetation restoration is the main measure for vegetation restoration and soil and water conservation in alpine mine dumps on the Qinghai-Tibet Plateau,China.However,there are few reports on the dynamic changes and the influencing factors of the soil reinforcement effect of plant species after artificial vegetation restoration under different recovery periods.We selected dump areas of the Delni Copper Mine in Qinghai Province,China to study the relationship between the shear strength and the peak displacement of the root-soil composite on the slope during the recovery period,and the influence of the root traits and soil physical properties on the shear resistance characteristics of the root-soil composite via in situ direct shear tests.The results indicate that the shear strength and peak displacement of the rooted soil initially decreased and then increased with the increase of the recovery period.The shear strength of the rooted soil and the recovery period exhibited a quadratic function relationship.There is no significant function relationship between the peak displacement and the recovery period.Significant positive correlations(P<0.05)exists between the shear strength of the root-soil composite and the root biomass density,root volume density,and root area ratio,and they show significant linear correlations(P<0.05).There are no significant correlations(P>0.05)between the shear strength of the root-soil composite and the root length density,and the root volume ratio of the coarse roots to the fine roots.A significant negative linear correlation(P<0.05)exists between the peak displacement of the rooted soil and the coarse-grain content,but no significant correlations(P>0.05)with the root traits,other soil physical property indices(the moisture content and dry density of the soil),and slope gradient.The coarse-grain content is the main factor controlling the peak displacement of the rooted soil.
文摘[目的]对比分析花岗岩侵蚀区不同水土流失治理年限的植物物种组成、群落结构及其多样性差异,为花岗岩侵蚀区水土流失治理和生态重建工作提供科学依据。[方法]采用空间代替时间的方法,在江西省兴国县平江流域花岗岩侵蚀区,选择治理4 a, 14 a, 24 a, 34 a的4个不同治理年限人工林为研究对象,以未人为治理林地和次生林作为对照,采用样方调查法,调查分析不同林地植物群落的物种组成、群落结构及植物多样性。[结果](1)共调查植物43种,隶属于31科41属,其中乔木层17种,灌木层8种,草本层18种。(2)“竹节沟+乔灌草”措施能够有效增加植物多样性,促进植被恢复与演替,不同治理年限林地的辛普森指数和香农—威纳指数均大于未人为治理林地。(3)随着水土流失治理年限的增加,植物群落的辛普森指数、香农—威纳指数和均匀度指数均呈上升—下降—上升的趋势,且均小于次生林。(4)不同治理年限林地、次生林和未人为治理林地之间的共有物种较少,整体上表现为不相似。[结论]仅靠自然封禁难以有效恢复花岗岩侵蚀区的植物多样性,“竹节沟+乔灌草”措施能有效促进植被恢复,提升植物多样性。
