摘要
[目的]为了了解洞庭湖区喜旱莲子草的发生、分布和危害情况。[方法]对洞庭湖区的6个不同生境的喜旱莲子草的分布、发生及危害情况进行了随机取样调查研究。[结果]喜旱莲子草普遍分布于河道、沟渠、路边、水塘、湿地、水田和旱地等生境,其发生频率均为100%。分布量多的生境是沟渠和湿地,其盖度平均为70.5%和88.4%。生长在河道和活水沟渠较其他生境表现为茎蔓长(分别为301 cm2、24 cm)、粗壮、组织幼嫩,茎蔓节间长(分别为9.7 cm8、.0 cm),其最长分枝多在中部且最长分枝长度(分别为93 cm6、6 cm)也相应较长。[结论]喜旱莲子草是河道、沟渠、水塘、湿地生境内发生量最大的优势种群,严重阻塞河道、沟渠,影响水产养殖,降低物种丰富度,防除困难,增加农业生态经济系统成本。
[ Objective] The porpose was to know the occurrence, distribution and harm situations of Alternanthera philoxeroides in Dongting lake area. [ Method] The occurrence, distribution and harm situations of A, philaceroides in 6 different habitats of Dongting lake area were investigated and studied with random sample. [Result] A. philaceroides was distributed in the habitats such as riverway, ditch, wayside, pool, wetland, paddy field and dry land generally and their occuring frequencies were all 100%. The habitats with much abundance were ditch and wetland and their average coverages were 70.5% and 88.4% respectively. Compared with the other habitats, the perfomances of A. philaceroides growing in fiverway and ditch with living water were thick, strong and long stem （301 cm, 224 cm respectively）, young tissue and long stem internedes （9.7 cm, 8.0 cm respectively）. Most of the longest branches were in the middle and their length was longer （93 cm, 66 cm respectively）. [ Conclusion] A. philoceroides was the dominant population with most occurrence quantity in the habitats such as riverway, ditch, pool and wetland. It blocked fiver-channel and ditch severely, affected aquiculture, reduced species richness, increased the cost of agricultural ecological economic system and was hard to be controlled.
出处
《安徽农业科学》
CAS
北大核心
2007年第22期6892-6894,共3页
Journal of Anhui Agricultural Sciences
基金
湖南省科技厅资助项目(06CK3049)
湖南文理学院创新团队项目(05CX01)
关键词
喜旱莲子草
分布
发生
危害
洞庭湖区
Alternanthera philoxeroides
Distribution
Occurrence
Harm
Dongting lake area
