摘要
在黄土高原自东南向西北,采用样带多点调查与定位监测相结合的研究方法,系统分析了不同草地类型封禁初期和封禁11 a草地生物量与固碳量变化特征。结果表明:4种草地类型地上活体植物、凋落物/地下活体根系和土壤中碳密度与碳储量分布规律均为森林草原>梁塬典型草原>丘陵典型草原>荒漠草原;草地封禁11 a,地上活体植物、凋落物0、～100 cm活体根系和土壤中碳密度总量,森林草原类型为63.38～97.65 t.hm-2,梁塬典型草原类型为49.04～68.80t.hm-2,丘陵典型草原类型为52.33～62.11 t.hm-2,荒漠草原类型为11.93～19.62 t.hm-2;碳储量4种草地类型分别为230.287 7 Tg C、332.306 7 Tg C、484.055 5 Tg C和113.856 3 Tg C;黄土高原草地总固碳量为573.10 Tg C,其中:活体植物为42.89 Tg C,占总固碳量的7.48%;凋落物为80.40 Tg C,占14.03%;活体根系为108.66 Tg C,占18.96%;土壤为341.15 Tg C,占59.53%。这充分表明,封禁不仅能使草地植被快速恢复和生物量增加,而且也是提高草地固碳潜力的一条重要途径。
The features of biomass and carbon sequestration were studied based on multi-point transect survey and combined with positioning monitoring methods for different type of grasslands from southeast to northwest in the Loess Plateau.The data were obtained for the pre-and post-11-year fencing.Results showed that carbon density and storage were decreased from southeast to northwest with an exponentially trend among four-type grasslands.In each type of grassland（aboveground living plants,litter/underground of soil root and soil）,the characteristics of distribution of carbon density and storage presented a tendency： forest steppe〉plateau steppe〉hilly steppe〉desert steppe.Grassland carbon density and storage,which included living plants,litter,0-100cm depth of soil root and soil,were 63.38-97.65t·hm^-2 and 230.2877 Tg C for forest steppe,49.04-68.80 t·hm^-2 and 332.3067 Tg C for plateau steppe,52.33-62.11 t·hm^-2 and 484.0555 Tg C for hilly steppe and 11.93-19.62t·hm^-2and 113.8563 Tg C for desert steppe respectively,after 11-year fencing.The total carbon sequestration of grasslands was 573.10 Tg C after 11-year fencing on the Loess Plateau.Among which,living plant was 42.89 Tg C（7.48% of the total carbon sequestration）,litter was 80.40 Tg C（14.03%）,living root was 108.66 Tg C（18.96%）,and soil was 341.15 Tg C（59.53%）.In conclusion,our results demonstrated that grassland fencing can not only restore vegetation and increase biomass,but can also significantly improve grassland carbon sequestration potential.
出处
《自然资源学报》
CSSCI
CSCD
北大核心
2011年第3期401-411,共11页
Journal of Natural Resources
基金
国家重点实验室基金(10502-Z8)资助项目
中国科学院重要方向项目(KZCX2-YW-441
KZCX2-YW-149)
国家重点基础研究发展计划973项目(2007CB106803)
国家自然科学基金重点项目(40730631)
关键词
黄土高原
天然草地
固碳量
碳密度
Loess Plateau
natural grassland
carbon sequestration
carbon density
