摘要
2 0 0 1年在郑州黄河沿岸对外来植物小花山桃草 ( Gaura parviflora)的生物学特性、地上生物量动态进行了研究。结果表明 :1小花山桃草各构件的变化特征为 :茎高、叶数和花序数在 6月 2 5日都达到生长高峰 ,随后茎高、花序数继续增长 ,叶数迅速降低。2小花山桃草每株花序数为 1 0 .9枝。每个花序产 1 34.2 3朵小花 ,产 1 2 6.75粒种子 ,结实率为 94.43% ,不育率为 5 .5 7%。3小花山桃草单株地上生物量、叶生物量、茎生物量在 6月 2 5日达到最大 ,花序生物量在 7月 2 0日达到最大。在生长初期 ,小花山桃草占样方内所有植物生物量的 78% ,7月 2 0日达 1 0 0 %。4小花山桃草入侵可能与植株高大、幼苗期短、生长快以及具有较强的传播和繁殖能力有关。
Invasion by exotic species is one of the main threats to the conservation of biodiversity. Once an invasive species becomes firmly established, its control can often be difficult and eradication is usually impossible. In addition, the impact on natural communities and ecosystem processes can be very serious. As international trade increases, the number of both accidental and intentional exotic introductions is likely to increase. To limit the impact that exotic species have on natural and man-made communities, we need to understand the major mechanisms that allow exotic plant to become invasive. Gaura parviflora is an exotic plant from the prairie of North America and can grow better in arid and low nutrient areas. Gaura parviflora is threatening the conservation of biodiversity on the banks of the Yellow River in Henan province of China. A studying regarding the biological characteristics, aboveground biomass dynamics, and invasive characteristics of Gaura parviflora is presented. The specific characteristics of every component are: the height of the stem, number of leaves and number of anthotaxies all get to the maximal numbers for individual plant in June 25, subsequently, the height of the stem and the number of anthotaxies continue to increase, but the number of leaves decrease rapidly. The growing model of the height of the stem is single kurtosis as those of number of leaves and number of anthotaxies. The number of anthotaxies of individual Gaura parviflora is 10.9 branches. Every anthotaxy produces an average of 134.23 flowerets and 126.75 seeds. Every plant produces an average of 1381.58 seeds and the seed setting rate is 94.43%. Every anthotaxy produces an average of 7.06 sterile seeds and the sterility rate is 5.57%. The average aboveground biomass of individual Gaura parviflora plant, biomass of leaves and biomass of stem all peak for individual plant on June 25. The biomass of anthotaxy peaks on July 20, their growing models are all single kurtosis. During the seedling stage, the ratio of stem a
出处
《生态学报》
CAS
CSCD
北大核心
2003年第8期1679-1684,共6页
Acta Ecologica Sinica
基金
国家重点基础研究课题资助项目 ( G2 0 0 0 0 4680 3 -4)~~
