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rubber tree plantation
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  橡胶园
     Comparison of UV-VIS spectra showed that E4/E6 ratios of humic acids from 0-5 cm and 5-20 cm depths in the secondary forest were higher than in the cropland and the rubber tree plantation soils, which indicated that the proportion of aromaticity in humic acids in the secondary forest was lower than the other two ecosystems.
     胡敏酸可见_红外光谱结果显示 ,次生林转变为农田和橡胶园后 ,0~ 2 0cm表层土壤E4/E6显著降低 ,这表明胡敏酸化学组成当中芳香族结构增加。
短句来源
     In 1962, Stylosanthes was firstly introduced to Hainan of China as a cover crop in rubber tree plantation from Malaysia.
     我国于1962年首次从马来西亚引种柱花草到海南岛,作为橡胶园的覆盖作物。
短句来源
     The proportion of carboxylic and phenolic groups in the humic acid was higher and the aliphatic and aromatic groups and polysaccharide-like substances were lower in the secondary forest than in the soils from the cropland and rubber tree plantation.
     次生林转变为农田和橡胶园后 ,胡敏酸中羧基和酚基结构比例降低 ,而脂肪族、芳香族和多聚糖比例增加。
短句来源
  “rubber tree plantation”译为未确定词的双语例句
     The biochemical activities were strongest in the soil of the mangrove forest (R. stylosa), secondly in the Aegiceras corniculatum forest and the rubber tree plantation.
     土壤生化活性以红海榄林土壤最强,其次为桐花树林和橡胶树林。
短句来源
  相似匹配句对
     THE CHANGE OF WATER IN THE RUBBER TREE ON CHILLING
     热带植物冷害时体内水分变化
短句来源
     Application of Biotechnology on Rubber Tree Breeding
     生物技术在橡胶树育种中的应用
短句来源
     SELECTION OF TREE SPECIES FOR REGENERATION OF SHELTERBELT FOR RUBBER PLANTATION
     胶园防护林更新树种的选择
短句来源
     Tree Animation
     树相关运动的模拟
短句来源
     Rubber Wear
     橡胶的磨耗
短句来源
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  rubber tree plantation
The management regimes were a native forest, a rubber tree plantation, a pasture and annual cropping.
      


In this paper the distribution, quantity and composition of the microbiological flora and the biochemical activities of the forest soil in coastal beach of Hepu were studied. The results showed that the bacteria numbers were most abundances in the microbiological flora of different types of eight forest soils, next the fungus, and thirdly the actinomycetes. A largest numbers of populations of the micro-organisms occurred in the soil under the mangrove forest (Phizophora stylosa), secondly in evergreen monsoon...

In this paper the distribution, quantity and composition of the microbiological flora and the biochemical activities of the forest soil in coastal beach of Hepu were studied. The results showed that the bacteria numbers were most abundances in the microbiological flora of different types of eight forest soils, next the fungus, and thirdly the actinomycetes. A largest numbers of populations of the micro-organisms occurred in the soil under the mangrove forest (Phizophora stylosa), secondly in evergreen monsoon forest and rubber tree plantafion.The activities of the bacillus were strongest in the soil under the rubber tree plantation, secondly under the mangrove forest(R.stylosa)and the evergreen monsoon forest.The biochemical activities were strongest in the soil of the mangrove forest (R. stylosa), secondly in the Aegiceras corniculatum forest and the rubber tree plantation.

本文对合浦滨海和海滩森林土壤微生物区系的分布、数量、组成及生化活性进行了研究。研究结果表明,八种不同类型森林土壤微生物区系均以细菌占优势,其次为真菌,放线菌最少。各类群微生物的数量以红海榄林土壤最高,其次为常绿季雨林和橡胶树林。芽孢杆菌活性以橡胶树林土壤最强,其次为红海榄林和常绿季雨林。土壤生化活性以红海榄林土壤最强,其次为桐花树林和橡胶树林。

Previous studies have suggested that land use changes affect not only the content of soil organic matter (SOM), but also the chemical composition of SOM. The objective of this study was to confirm this finding at a site in tropical China. To understand the effect of land use changes on the quantity and quality of SOM, spectroscopic characteristics of humic acids from the topsoil (0-5 cm and 5-20 cm) and subsoil (20-40 cm) from a secondary tropical forest, a cropland, and a rubber tree plantation were investigated...

Previous studies have suggested that land use changes affect not only the content of soil organic matter (SOM), but also the chemical composition of SOM. The objective of this study was to confirm this finding at a site in tropical China. To understand the effect of land use changes on the quantity and quality of SOM, spectroscopic characteristics of humic acids from the topsoil (0-5 cm and 5-20 cm) and subsoil (20-40 cm) from a secondary tropical forest, a cropland, and a rubber tree plantation were investigated in Xishuangbanna, southwest China. The cropland had been cultivated for six years following the clearing of a secondary forest, and the 3-year old rubber tree plantation had been established on land that had been cultivated for 3 years following clearing of a secondary forest. Humic acids were extracted using an alkaline solution (0.1 M NaOH), and the extractions analyzed using Ultraviolet-visible spectroscopy (UV-VIS) and Fourier-Transform infrared spectroscopy (FT-IR). Six years after the conversion of secondary forest to cropland, SOM content in the 0-5 cm and 5-20 cm topsoil samples were reduced by 33.6% and 23.7%, respectively. Conversion of secondary forests to rubber tree plantations also greatly reduced SOM content by 28.6% in the top horizon (0-5 cm) and 27.6% at 5-20 cm depth. Comparison of UV-VIS spectra showed that E4/E6 ratios of humic acids from 0-5 cm and 5-20 cm depths in the secondary forest were higher than in the cropland and the rubber tree plantation soils, which indicated that the proportion of aromaticity in humic acids in the secondary forest was lower than the other two ecosystems. FT-IR spectra also indicated that land use change influenced the chemical composition of SOM. The proportion of carboxylic and phenolic groups in the humic acid was higher and the aliphatic and aromatic groups and polysaccharide-like substances were lower in the secondary forest than in the soils from the cropland and rubber tree plantation.

为了探讨西双版纳地区土地利用变化对土壤有机质含量及其化学组成的影响 ,选取了相邻的次生林、耕种 6年的农田和定植 3年的橡胶园样地 ,对其 0~ 5cm和 5~ 2 0cm表层土壤中有机质含量、胡敏酸的光谱学特性进行了分析。研究结果表明 ,次生林转变为农田之后 ,0~ 5cm和 5~ 2 0cm表层土壤有机质含量分别降低 33.6 %和2 3.7% ;而次生林转变为橡胶园 ,分别降低 2 8.6 %和 2 7.6 %。胡敏酸可见_红外光谱结果显示 ,次生林转变为农田和橡胶园后 ,0~ 2 0cm表层土壤E4/E6显著降低 ,这表明胡敏酸化学组成当中芳香族结构增加。傅立叶变换红外光谱结果同样表明 ,土地利用变化影响土壤有机质的化学组成。次生林转变为农田和橡胶园后 ,胡敏酸中羧基和酚基结构比例降低 ,而脂肪族、芳香族和多聚糖比例增加。

The ability for vegetation and soil organic matter (SOM) to sequester atmospheric CO 2 has received a lot of attention recently. Two management options being considered for enhancing C sequestration from the atmosphere include tropical forest conservation and establishment of plantations; however, there is still considerable debate regarding the appropriateness of using plantations and the sequestration potential of tropical plantations. There are 1.3×10 5 hm 2 of rubber trees...

The ability for vegetation and soil organic matter (SOM) to sequester atmospheric CO 2 has received a lot of attention recently. Two management options being considered for enhancing C sequestration from the atmosphere include tropical forest conservation and establishment of plantations; however, there is still considerable debate regarding the appropriateness of using plantations and the sequestration potential of tropical plantations. There are 1.3×10 5 hm 2 of rubber trees (Hevea brasiliensis) plantations in Xishuangbanna, southwest China, which account for approximately 14% of the forest lands in this region. In this study, eleven plantations of different ages were selected to investigate C sequestration in the vegetation and soils following the establishment of rubber tree plantations on former arable lands. The results indicated that the average biomass growth rates of the rubber trees, calculated according to two different biomass growth equations, were 10.2×10 3 and 9.4×10 3 kg t·hm -2 ·a -1 . Soil C stocks in the top 40 cm and 1 m of soil increased at rates of 0.61×10 3 and 0.72×10 3 kg t C·hm -2 ·a -1 , respectively. In total, C sequestration was approximately 5.82×10 3 to 5.42×10 3 kg t C·hm -2 ·a -1 in the vegetation and soil as calculated by the two biomass growth models. When comparing the two models, our results showed that the biomass calculated based on the equation of Tang et al. was higher than that based on the equation of Brown, especially in young- and middle-aged rubber tree plantations.

由于温室气体的大量排放引起的全球气候变暖等环境问题日益严重 ,近年来人们开始考虑通过植被和土壤的碳固存 ,以缓解大气中CO2 浓度的升高速度 ,减缓温室效应的影响。有研究表明 ,热带原始森林的保护和人工林的建立能有效地固存大气中的碳。但是 ,在建立热带种植园和人工林以固存大气CO2 的可行性及其碳的固存潜力大小等方面还存在较大争议。云南省西双版纳自治州是我国重要的热带地区之一 ,目前橡胶 (Heveabrasiliensis)园的面积为 1.3× 10 5hm2 ,约占该地区林地面积的 14 %。在本研究中 ,选择 11块在弃耕后的农田上建立的橡胶园 (定植年限为3至 38年 ) ,初步探讨了橡胶园建立后植被和土壤中碳的固存规律。两个生物量模型 (唐建维等的模型和Brown模型 )的模拟结果显示 ,橡胶园建立后植被中生物量的平均增长速率分别为 10 .2× 10 3 和 9.4× 10 3 kg·hm-2 ·a-1,4 0和10 0cm表层土壤碳的平均固存速率分别为 0 .6 1× 10 3 和 0 .72× 10 3 kgC·hm-2 ·a-1,植被和 10 0cm表层土壤中碳的平均固存速率为 5 .82×...

由于温室气体的大量排放引起的全球气候变暖等环境问题日益严重 ,近年来人们开始考虑通过植被和土壤的碳固存 ,以缓解大气中CO2 浓度的升高速度 ,减缓温室效应的影响。有研究表明 ,热带原始森林的保护和人工林的建立能有效地固存大气中的碳。但是 ,在建立热带种植园和人工林以固存大气CO2 的可行性及其碳的固存潜力大小等方面还存在较大争议。云南省西双版纳自治州是我国重要的热带地区之一 ,目前橡胶 (Heveabrasiliensis)园的面积为 1.3× 10 5hm2 ,约占该地区林地面积的 14 %。在本研究中 ,选择 11块在弃耕后的农田上建立的橡胶园 (定植年限为3至 38年 ) ,初步探讨了橡胶园建立后植被和土壤中碳的固存规律。两个生物量模型 (唐建维等的模型和Brown模型 )的模拟结果显示 ,橡胶园建立后植被中生物量的平均增长速率分别为 10 .2× 10 3 和 9.4× 10 3 kg·hm-2 ·a-1,4 0和10 0cm表层土壤碳的平均固存速率分别为 0 .6 1× 10 3 和 0 .72× 10 3 kgC·hm-2 ·a-1,植被和 10 0cm表层土壤中碳的平均固存速率为 5 .82× 10 3 和 5 .4 2× 10 3 kgC·hm-2 ·a-1,而定植 4 0年后植被和 10 0cm表层土壤碳的固存潜力为 2 32 .8× 10 3 和 2 16 .8× 10 3 kgC·hm-2 。对两个模型的比较结果显示 ,唐建维等的模型生

 
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