%0 Journal Article
%T Effects of cultivation regimes on weed community structures in newly reclaimed sandy farmlands<br>耕作方式对新垦沙地农田杂草群落结构的影响
%A YANG Rong
%A SU Yong-Zhong
%A <br>杨荣
%A 苏永中
%J 中国生态农业学报
%D 2010
%I 
%X The varieties, quantities, coverage rates and heights of farmland weeds were surveyed and species diversity and richness analyzed in a newly reclaimed sandy farmland located in the margin oasis of the middle reaches of Heihe River Basin, Northwest China. The aim of the study was to evaluate the effects of cultivation regimes on weed community structure characteristics in the basin. A total of 16 weed species from 10 families were identified and recorded. The most common species of weed communities in newly reclaimed sandy farmlands are Chenopodium album, Eleusine indica, Setaria viridis and Amaranthus retroflexus. Weed community compositions are largely influenced by cultivation regimes. Weed species richness, Shannon-Wiener index and Simpson index are lower in conventional cultivation regimes (film mulching, autumn plowing and continuous maize planting). Those could, however, be improved under straw mulching, zero-autumn plowing and maize-soybean rotation treatments. Compared with film mulching, E. indica has a higher dominance ratio while C. album and A. retroflexus have lower dominance ration under straw mulching treatments. Compared with autumn plowing, S. viridis, A. reteroflexus, Silene conoidea and C. glaucum have a higher dominance ratio whereas E. indica has a lower dominance ratio under zero-autumn plowing treatments. Also compared with continuous maize planting, S. conoidea exhibits a higher dominance ratio under maize-soybean rotation regimes. There exist random rare weed species distribution in the field, which are not significantly effected by cultivation regimes. Results further show that weed species is few and weed communities composition is single in a newly reclaimed sandy farmland, and cultivation regimes obviously influence weed species diversity and community structure in reclaimed sandy farmlands. It is recommended to conduct additional research for a non-subjective interpretation of the effects of cultivation regimes on weed growth in order to guide weed control in newly reclaimed sandy farmlands.
%K Margin oasis
%K Newly reclaimed sandy farmland
%K Farmland weed
%K Cultivation regime
%K Community structure<br>边缘绿洲
%K 新垦沙地
%K 农田杂草
%K 耕作方式
%K 群落结构
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=03F54A49DE00578AA0E5DDF5BC021AA7&cid=1A8B5357F0EF07B8&jid=AB3ABF502E2E1FF39F0E3B80164C9031&aid=A3590E191EDB5D6F4DA6E4C9258303B0&yid=140ECF96957D60B2&vid=13553B2D12F347E8&iid=B31275AF3241DB2D&sid=E2F55FDAFC844F27&eid=966030800FCA5D46&journal_id=1671-3990&journal_name=中国生态农业学报&referenced_num=0&reference_num=0