[Multi-species and multi-scale patterns and species associations of sand-fixing plantations].
Taking three sand-fixing plantations Hedysarum scoparium and Calligonum mongolicum, Haloxylon ammodendron on the oasis verges in northeast Ulanbuhe desert irrigated by Huanghe River as test objects, the multi-species and multi-scale patterns and the species associations of the plantations were investigated by contiguous quadrats transects method, with the natural vegetation nearby as the control. The results showed that 74.29% of the natural vegetation was dominated by single species pattern of Artemisia ordosica, and 24. 99% was dominated by single species pattern of Nitraria tangutorum. The sand-fixing plantations gradually became close-to-natural vegetation. Compared with natural vegetation, the sand-fixing plantations had higher pattern intensity, and played important role in sand-fixing and in accelerating the regeneration and succession of natural sand-fixing plants. However, with the succession, artificially planted shrubs would decline, while natural plants would be dominant. Therefore, it should be better to make use of the native dominated species in sand-fixing engineering. Under the almost same conditions, pattern scale was highly correlated with the characters and the associations of dominated species. The species association was correlated with the patch scale and species composition, as well as the species contribution to the patch.
Li
Hui-yong
HY
Shanxi Academy of Water Resource and Hydraulics Research, Taiyuan 030002, China. lhy.1975@163.com
Li
Hui-qing
HQ
Li
Qing-he
QH
Liu
Jian-feng
JF
Jiang
Ze-ping
ZP
D002681:China; D003247:Conservation of Natural Resources; D003889:Desert Climate; D017753:Ecosystem; D063245:Plant Development; D010944:Plants / Q000145:classification; D013045:Species Specificity