论文部分内容阅读
用生态样带和连续取样方法研究了广西英罗港红树植物种群的分布 ,结果表明 :在 36 0 m长的生态样带中 ,从内滩海堤到外滩 (无红树林的光滩 ) ,土壤的机械组成、养分和盐分含量均存在明显的梯度变化 ,0～ 2 0 cm土壤的有机质、全氮、水解氮、全磷、速效磷、全盐分别是 1 .1 1 %～ 6 .6 7% ,0 .0 2 1 %～ 0 .1 36 % ,4 1 .6～ 2 0 3.7mg/kg,0 .0 0 87%～ 0 .0 30 9% ,2 .78～ 1 4 .32 mg/kg和 1 0 .2 0‰～ 31 .1 2‰ ;土壤砂粒、粉粒和粘粒分别是 5 7.3%～ 89.6 % ,8.1 %～ 2 9.0 %和 2 .3%～1 3.7% ,除土壤砂粒含量与距离呈正相关外 ,其它测定因子均表现为负相关关系。随着与海堤距离的加大 ,红树植物种群的分布出现明显的差异。在距岸 2 4 0～ 34 0 m的滩面 ,以桐花树种群的重要值最高 ,其重要值指数变化在 91 .6 6～ 1 75 .0 2之间 ,向陆地演进 ,其种群的重要值逐渐减少 ;在 4 0～ 2 30 m,红海榄种群占居明显优势 ,其重要值指数为 1 1 0 .6 6～2 6 4 .86 ;在距岸 0～ 30 m的海滩 ,以木榄种群占优势 ,其重要值指数为 2 1 3.1 6～ 2 5 0 .5 3;白骨壤种群和秋茄种群的重要值都较低 ,这主要是它们的种群密度低所致。红树植物种群的分布表现为典型的过渡替代的交错分布 ,从海堤到外滩 ,木榄种群取代红海榄
The distribution of mangrove species in Yingluo Bay of Guangxi Province was studied by means of ecological sampling and continuous sampling. The results showed that in the 3600-m-long ecological sample zone, from the inland seawall to the Bund (bare beach of mangrove) The mechanical composition, nutrient content and salinity content of soil had obvious gradient changes. The contents of organic matter, total nitrogen, hydrolyzed nitrogen, total phosphorus, available phosphorus and total salt in 0 ~ 20 cm soil were respectively 1.1 1% ~ 6. 6 7%, 0 .0 2 1% ~ 0. 1 36%, 4 1 .6 ~ 2 0 3.7mg / kg, 0 0 87% -0 0 30 9%, 2 .78 ~ 1 4. 32 mg / kg and 10.2% ‰ ~ 31.1 2 ‰, respectively. Soil sand, silt and clay were 5 7.3% ~ 89.6%, 8.1% ~ 2 9.0% and 2.3% ~ 1.3% In addition to the positive correlation between soil sand content and distance, the other test factors showed a negative correlation. With the increase of the distance to the seawall, the distribution of mangrove species shows obvious differences. The important value of Aegiceras corniculatum was the highest at the beach surface from 240 to 3400 m away from the shore, and its importance index changed between 91.66 and 1.752. The value of them decreased gradually. From 40 to 230 m, the population of Rhododendron bracteatum occupies the obvious advantage, with the important value index of 116.62 to 246.486. On the beaches of 0-30 m from the shore, The population is dominant, and its important value index is 2 1 3.1 6 ~ 2.5 5 0.53. The values of both the Avicennia marina and Kandelia candel are lower, mainly because of their low population density. The distribution of mangrove species showed the staggered distribution of typical transitional substitution. From the seawall to the Bund,