Chin J Plan Ecolo ›› 2003, Vol. 27 ›› Issue (4): 503-509.doi: 10.17521/cjpe.2003.0073

• Research Articles • Previous Articles     Next Articles

The Individual Distribution Patterns and Soil Elements Heterogeneity During the Degradation of Grassland in Ordos

CHENG Xiao-Li, AN Shu-Qing, LI Yuan, ZHUO Yuan-Wu, GUAN Yong-Jian, LIU Shi-Rong   

  • Online:2015-11-04 Published:2003-04-10
  • Contact: LIU Xing

Abstract:

We analyze the distribution patterns of the populations and the dominants of Ordos grassland in its degradation, using Combined Count-distance Analysis Method. `Statistica’ was used to analyze soil elements (total organic carbon, total nitrogen and dissolve nitrogen) in root-sphere and bare openings to show the process of soil element redistribution with changes of plant life-forms. The Stipa bungeana community, S. bungeana + Artemisia ordosica community,community,A. ordosica + Cynanchum komarovii community and C. komarovii community that presented successionally degraded stages in desertification were chosen for the study. The results show that, during the degradation course of the grassland, most of the distribution patterns of populations are clump and random distribution at different scales, but multi-population distribution in the S. bungeana + A. ordosica community and in the A. ordosica + C. komarovii community was even with A. ordosica and C. komarovii as the dominant species. There was soil element heterogeneity at different degrees in single-dominant communities. The soil elements had the strongest heterogeneity in A. ordosica community. The heterogeneity in co-dominant communities was inferior to single-dominant communities. At the beginning of degradation, invasion of the S. bungeana grassland by the shrub A. ordosica does not lead to the immediate development of “islands of fertility". Competition for soil elements between S. bungeana and A. ordosica makes the S. bungeana + A. ordosica community temporarily homogeneous. Similarly, the soil elements have weaker heterogeneity in A. ordosica + C. komarovii community. The competition for soil water and soil resources leads to plant spatially homogeneous distributions and spatial homogeneity of soil elements in co-dominant communities. The heterogeneity process of the soil chemistry was characterized first by total organic carbon (TOC) heterogeneity and later by total nitrogen (TN) heterogeneity. Soil TOC is derived mainly from decomposed plant material; soil TN is provided by nitrogen-plant detritus, either plant-fixed or gas-fixed nitrogen. Thus, it is tentatively concluded from the results that the heterogeneity process is initially characterized by plant spatially heterogeneity; then the plant spatial heterogeneity leads to the spatial heterogeneity of soil elements.

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[2] CHENG Hong-Yan. Introduction of State Key Laboratory of Biomembrane and Membrane Biotechnology[J]. Chin Bull Bot, 1998, 15(04): 78 .
[3] Liu Dong-zhuo and Li Lan. The Karyotype Analysis of Solanum pseudocapsicum[J]. Chin Bull Bot, 1992, 9(03): 50 .
[4] WANG Bao-Shan;LI De-Quan;ZHAO Shi-Jie;MENG Qing-Wei and ZOU Qi. Effects of Iso-osmotic NaCl and KCl Stress on Growth and Gas Exchange of Sorghum Seedlings[J]. Chin Bull Bot, 1999, 16(04): 449 -453 .
[5] LI Yao-Dong WEI Yu-Ning XU Ben-Mei. Study on the ABA Content and SOD Activity in Ancient Lotus and Modern Lotus Seeds[J]. Chin Bull Bot, 2000, 17(05): 439 -442 .
[6] LI Zhong-Kui HU Hong-Jun LI Ye-Guang. Advances in Molecular Phylogenetic Relationship of Volvocales[J]. Chin Bull Bot, 2002, 19(04): 419 -424 .
[7] WANG Ting SU Ying-Juan ZHU Jian-Ming HUANG Chao LI Xue-Yan. PCR_RFLP Analysis of rbc L Genes in Taxaceae and Related Taxa[J]. Chin Bull Bot, 2001, 18(06): 714 -721 .
[8] . [J]. Chin Bull Bot, 1994, 11(专辑): 51 .
[9] Dong Shu-ting, Hu Chang-hao, Yue Shou-song, Wang Qun-ying, Gao Rong-qi, Pan Zi-long. The Characteristics of Canopy Photosynthesis of Summer Corn (Zea mays) and its Relation with Canopy Structure and Ecological Conditions[J]. Chin J Plan Ecolo, 1992, 16(4): 372 -378 .
[10] YANG Wei, YE Qi-Gang, LI Zuo-Zhou, HUANG Hong-Wen. GENETIC DIFFERENTIATION OF QUANTITATIVE TRAITS AND LOCAL ADAPTABILITY OF REMNANT POPULATIONS OF ISOETES SINENSIS AND IMPLICATIONS FOR CONSERVATION AND GENETIC REINFORCEMENT[J]. Chin J Plan Ecolo, 2008, 32(1): 143 -151 .