Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

ABSECNE OF TREE SEEDS IMPEDES SHRUBLAND SUCCESSION IN SOUTHERN CHINA

J Wang, C Zou, H Ren and WJ Duan
Journal of Tropical Forest Science
Vol. 21, No. 3 (July 2009), pp. 210-217
Stable URL: http://www.jstor.org/stable/23616800
Page Count: 8
  • Read Online (Free)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
ABSECNE OF TREE SEEDS IMPEDES SHRUBLAND SUCCESSION IN SOUTHERN CHINA
Preview not available

Abstract

Change in landuse in southern China has resulted in the abandonment of over 40 million ha of degraded grazing pasture and cultivated farmland, which have consequently converted to shrubland. Shrubland has low economic value and provides limited ecosystem services but is now the dominant vegetation in three provinces of southern China. Effective management of such shrubland ecosystem requires improved understanding of many ecological factors, including sources of viable seeds in the soil seed bank and the interaction between the seed bank and the current vegetation. We investigated the soil seed bank in a shrubland using a seedling germination assay, and compared the species composition in the seed bank with vegetation community using Sorensen's coefficient. While total seed bank density in the shrubland was high, the Sorensen's coefficient and species richness in the soil seed bank were low. The soil seed bank was mainly dominated by grass and shrub species; no pine or other indigenous tree seeds were detected. Our findings suggest that the limited seed source of tree species is one of the primary factors slowing or stopping secondary succession in southern China. Direct planting of tree seedlings may facilitate secondary succession in the severely degraded shrublands. Perubahan penggunaan tanah di selatan negara China mengakibatkan lebih 40 juta hektar padang rumput ternak dan tanah ladang usang terbiar dan akhirnya bertukar menjadi tanah semak. Tanah semak mempunyai nilai ekonomi yang rendah dan sumbangannya terhadap ekosistem terhad. Kini, belukar ialah vegetasi dominan di tiga buah wilayah di selatan negara China. Pengurusan ekosistem tanah semak yang berkesan memerlukan pemahaman yang lebih baik tentang faktor ekologi seperti sumber biji benih berdaya hidup dalam bank biji benih tanah dan interaksi antara bank biji benih dengan vegetasi semasa. Bank biji benih tanah di tanah semak dikaji menggunakan ujian percambahan biji benih. Komposisi spesies dalam bank biji benih dibandingkan dengan vegetasi komuniti menggunakan koefisien Sorensen. Kepadatan bank biji benih di tanah semak tinggi tetapi koefisien Sorensen dan kekayaan spesiesnya rendah. Bank biji benih tanah didominasi oleh spesies-spesies rumput dan pokok renek. Biji benih pokok pain atau biji benih pokok asli tidak dicerap. Keputusan mencadangkan bahawa sumber biji benih spesies pokok yang terhad merupakan salah satu faktor utama yang melambat atau memberhentikan sesaran sekunder di selatan negara China. Penanaman terus anak benih pokok mungkin dapat mempercepat sesaran sekunder di tanah semak yang dinyahgred dengan teruk.

Page Thumbnails

  • Thumbnail: Page 
210
    210
  • Thumbnail: Page 
211
    211
  • Thumbnail: Page 
212
    212
  • Thumbnail: Page 
213
    213
  • Thumbnail: Page 
214
    214
  • Thumbnail: Page 
215
    215
  • Thumbnail: Page 
216
    216
  • Thumbnail: Page 
217
    217