北疆滴灌棉田杂草生态位机制研究

Lizhong Sun, Jing Chen, Xiujin Hu, Tao Guo, Tong Liu
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引用次数: 0

摘要

本研究旨在探讨北疆棉田滴灌和机收棉田杂草的生态位机制和多样性。采用七级可视化方法对新疆北部5个地区25个滴灌机收棉田杂草的优势类群进行了调查,并将其转化为重要值数据,在此基础上计算出20种主要杂草的生态位宽度和生态位重叠。在生态位重叠值的基础上,得出了DCA排序和图论聚类分析的最小生成树所揭示的生态相似性。结果表明:盘花、藜、反曲苋、龙葵、芦苇(Cav.)Trin。前Steud。,Setria viridis(L.)Beauv。,阿布蒂隆·泰奥弗拉斯蒂·梅迪库斯。,木槿属。,九种杂草是北疆棉田滴灌和机收的优势种(恶性杂草),具有广阔的生态位。S.nigrum L.和C.album L.、A.theoprasti Medicus的生态位重叠值。以及A.retroflexus L.、H.trinum L.和E.crusgall(L.)Beauv。,A.retroflexus L.和E.crugalli(L.)Beauv。更高。基于生态位重叠值的最小生成树方法反映了杂草生态需求的相似程度,将20种主要杂草分为4组。25个采样点20种主要杂草的DCA排序综合生态需求:恶性杂草均集中在中央排序图上,与一般杂草的区别明显,最小生成树DCA排序图对应较好。最小生成树通过其关注的结果表明,杂草最符合生态要求,但不适用于没有相邻物种,也不清楚它们之间的生态关系,DCA排序可以完整地反映所有杂草之间的生态相似关系,尽管这种方法会通过数据转换损失少量的生态信息。因此,将两种方法结合起来,优势互补,优势明显。随着滴灌年龄年的增加,黑穗草、珙桐、珙桐等9种恶性杂草的优势值与滴灌年龄年之间存在显著的回归关系。
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The Niche Mechanism of Weeds in Cotton Field Under Drip-Irrigated in North Xinjiang, China
The aim of this study was to investigate the niche mechanism and diversity of weeds in drip-irrigated and machine-harvested cotton fields in north Xinjiang, China. The dominant classes of weeds in 25 cotton fields under drip-irrigated and machine-harvested in 5 regions of north Xinjiang were investigated by seven-grade visual method, and converted to important value data, the 20 main weeds niche breadth and niche overlap were caculated on the basis of the data above. The ecological similiarity revealed by DCA sorting and minimum spanning tree of graph theory cluster analysis is drawed on the basis of the niche overlap value. The results show that Convolvulus arvensis L., Chenopodium album L., Amaranthus retroflexus L., Solanum nigrum L., Phragmites australis (Cav.) Trin. ex Steud., Setria viridis (L.) Beauv., Abutilon theophrasti Medicus., Hibiscus trionum L., Echinochloa crusgalli (L.) Beauv., nine species of weeds, which are the dominant species (malignant weeds) in drip-irrigated and machine-harvested cotton fields in North Xinjiang, have wide niche. The niche overlap values of S. nigrum L. and C. album L., A. theophrasti Medicus. and A. retroflexus L., H. trionum L. and E. crusgall (L.) Beauv., A. retroflexus L. and E. crusgalli (L.) Beauv. are higher. The minimal spanning tree method based on niche overlap value to reflect similar degree of the ecological needs of the weeds, 20 main weeds will be divided into 4 groups. DCA ordination of 20 main weeds comprehensive ecological needs of 25 sampling sites: the vicious weeds all gathered at the central sorting chart, the distinction is obvious with the general weed and the corresponding of DCA ordination chart with minimal spanning tree is better. The minimal spanning tree by its focus on the results of which show that weeds are the most similar to the ecological requirements, but not be used for the no adjacent species, and no clear that the ecological relationship between them, the DCA sorting can reflect the ecology similar relations between all weeds wholely, though this method will lose a small amount of ecological information through the data conversion. Therefore, the two methods will be combined, complementary advantages, the superiority is obvious. Along with drip irrigation age years increase, S. nigrum L., C. arvensis L., C. album L. and so on, between dominant value of nine species of malignant weeds and the drip irrigation age years has the remarkable regression relations.
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来源期刊
Journal of Biobased Materials and Bioenergy
Journal of Biobased Materials and Bioenergy 工程技术-材料科学:生物材料
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60
审稿时长
6 months
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