The effect of land management on carbon and nitrogen status in plants and soils of alpine meadows on the Tibetan plateau

被引:56
作者
Wang, WY
Wang, QJ
Wang, CY
Shi, HL
Li, Y
Wang, G [1 ]
机构
[1] Lanzhou Univ, Dept Biol, Lanzhou 710000, Gansu, Peoples R China
[2] Chinese Acad Sci, NW Plateau Inst Biol, Xining 810001, Qinghai, Peoples R China
[3] Qinghai Normal Univ, Dept Biol, Xining 810008, Qinghai, Peoples R China
关键词
alpine Kobersia meadow; carbon (C) and nitrogen (N) status; plants and soils; rehabilitation; severely degraded grasslands; Tibetan plateau;
D O I
10.1002/ldr.661
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Large-scale grassland rehabilitation has been carried out on the severely degraded lands of the Tibetan plateau. The grasslands created provide a useful model for evaluating the recovery of ecosystem properties. The purposes of this research were: (1) to examine the relative influence of various rehabilitation practices on carbon and nitrogen in plants and soils in early secondary succession; and (2) to evaluate the degree to which severely degraded grassland altered plant and soil properties relative to the non-disturbed native community. The results showed: (1) The aboveground tissue C and N content in the control were 105-97 g m(-2) and 3.356gm(-2), respectively. The aboveground tissue C content in the mixed seed treatment, the single seed treatment, the natural recovery treatment and the severely degraded treatment was 137 per cent, 98 per cent, 49 per cent and 38 per cent, respectively, of that in the control. The corresponding aboveground tissue N content was 109 per cent, 84 per cent, 60 per cent and 47 per cent, respectively, of that in the control. (2) Root C and N content in 0-20 cm depths of the control had an 2 2 average 1606 gm(-2) and 30-36 gm(-2) respectively. Root C and N content in the rehabilitation treatments were in the range of 26-36 per cent and 35-53 per cent, while those in the severely degraded treatment were only 17 per cent and 26 per cent of that in the control. (3) In the control the average soil C and N content at 0-20 cm was 11307 gm(-2) and 846 gm(-2), respectively. Soil C content in the uppermost 20 cm in the seeded treatments, the natural recovery treatment and the severely degraded treatment was 67 per cent, 73 per cent and 57 per cent, respectively, while soil N content in the uppermost 20cm was 72 per cent, 82 per cent and 79 per cent, respectively, of that in the control. The severely degraded land was a major C source. Restoring the severely degraded lands to perennial vegetation was an alternative approach to sequestering C in former degraded systems. N was a limiting factor in seeding grassland. It is necessary for sustainable utilization of seeding grassland to supply extra N fertilizer to the soil or to add legume species into the seed mix. Copyright (c) 2005 John Wiley & Sons, Ltd.
引用
收藏
页码:405 / 415
页数:11
相关论文
共 30 条
[1]  
*AGR PROGR OFF QIN, 1997, SOILS QINGH PROV, P64
[2]  
[Anonymous], GEOGR RES, DOI [10.11821/yj1999040003, DOI 10.3321/J.ISSN:1000-0585.1999.04.003]
[3]  
[Anonymous], 1996, CLIMATE CHANGE 1995
[4]  
BAER SG, 2001, THESIS KANSAS STATE
[5]   Grazing intensity alters soil respiration in an alpine meadow on the Tibetan plateau [J].
Cao, GM ;
Tang, YH ;
Mo, WH ;
Wang, YA ;
Li, YN ;
Zhao, XQ .
SOIL BIOLOGY & BIOCHEMISTRY, 2004, 36 (02) :237-243
[6]  
CAO GM, 2001, CHINESE KOBERSIA MEA, P188
[7]  
Deng ZF, 2001, CHINESE KOBERSIA MEA, P95
[8]   SORBED CHEMICAL-TRANSPORT IN OVERLAND-FLOW .2. ENRICHMENT RATIO VARIATION WITH EROSION PROCESSES [J].
GHADIRI, H ;
ROSE, CW .
JOURNAL OF ENVIRONMENTAL QUALITY, 1991, 20 (03) :634-641
[9]   Effects of human disturbance and cryoturbation on soil iron and organic matter distributions and on carbon storage at high elevations in the Cairngorm Mountains, Scotland [J].
Grieve, IC .
GEODERMA, 2000, 95 (1-2) :1-14
[10]   Soil carbon stocks and land use change: a meta analysis [J].
Guo, LB ;
Gifford, RM .
GLOBAL CHANGE BIOLOGY, 2002, 8 (04) :345-360