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Results showed that high quality black tea was mainly produced in red soil, red yellow soil and intermountain alluvial terraces formed by fluvial outwash, with loose soil texture and high soil organic matter content.

分析表明,优质红茶产地主要是红壤、红黄壤和河流冲积形成的山间冲积台地,土壤质地疏松,有机质含量较高。

The spores of Neocheiropteris palmatopedate were cultured in improved Knop's medium, in-situ humus soil and red soil respectively. Spore germination and gametophyte development were observed under optical microscope and dissecting microscope, and the impact of four culture methods on the gametophyte development and sexual reproduction was compared. On these experiments, its cause of endangerment was analyzed.

采用改良Knop's固体培养基、原生境腐殖质土和红壤分别培养扇蕨孢子,光学显微镜及解剖镜下观察记录其于包子萌发及配子体发育过程,比较了3种培养方法对其配子体发育和有性繁殖的影响,并在此基础上探讨了扇蕨的濒危原因。

Results show that content of labile organic carbon in soil aggregates decreased with soil depth.

在23年的长期田间定位试验区,研究了长期施肥对红壤性水稻土团聚体活性有机碳含量的影响。

With the increase of soil pH, Cd desorption decreased rapidly in the presence of oxalic acid and malic acid.

随着pH值升高,草酸、苹果酸以及不含有机酸的对照溶液对红壤中Cd的解吸率都快速下降。

The eco-toxicity of Cu, Zn, Pb, and Cd in the single form was tested with four types of soils( red loam soils, meadow brown soils, chestnut soils, and dark brown soik) and their combined effect was determined with meadow brown soils.

测定了4种土壤(红壤、草甸棕壤、暗棕壤和栗钙土)条件下,Cu、Zn、Pb和Cd单一污染对小麦种子发芽与根伸长抑制率及其复合污染效应结果表明,同一浓度下,重金属对小麦根伸长抑制率均明显大于对种子发芽抑制率。

In this thesis, seed germination and root elongation test, early growth test were performanced by chemical spiked (Cu, Zn, Pb and Cd; Phenanthrenen, Pyrene; and1, 2, 4-trichlorobenzene) in four types of soils (red load soil, meadow brown soil, chestnut soil and dark brown soil) using wheat, Chinese cabbages , tomatoes , turnip and scallion as plants: The toxicity of heavy metals Cu.

本文选择4类典型土壤(红壤、草甸棕壤、暗棕壤和栗钙土),以(小麦、白菜、萝卜、西红柿、大葱)为供试植物,进行了重金属(Cu、Zn、Pb、Cd)、有机氯、多环芳烃污染的植物种子发芽与根伸长抑制试验;植物早期生长试验研究;以草甸棕壤为供试土壤,进行了重金属(Cu、Zn、Pb、Cd)单一、复合污染条件下的蚯蚓急性毒性实验;以草甸棕壤、污染土壤和生物修复土壤进行蚕豆根尖实验和土壤原生动物实验。

They could be sorted into 31 groups, with Acarina, Collembola and Nematoda, being the dominant groups, which occupied 92.33% of the total samples, and formed the main body of the forest soil animal community.

通过对湘中丘陵山地红壤森林土壤动物群落定位调查,共获得36018只土壤动物标本,计有31类,其中蜱螨类、弹尾类和线虫类为优势类群,三类群占动物总量的92.33%,为森林土壤动物群落的主体。

By combining the experiment, field observation and data collection with SWAT model simulation, the water budget in different types of land use (forest and grass ecosystems, orchard and crop ecosystems) were calculated by SWAT model. Then the water circulation and water budget in the following years were predicted and the main factors that influenced the water budget in hilly region of red soil were analysised.

本研究采用室内测定、野外观测、资料搜集与模型模拟相结合的方法,应用SWAT模型研究了赣东北红壤丘岗区不同土地利用方式的水量平衡,并对林草系统未来几年的水量平衡进行了预测,分析了区域水量平衡的影响因子。

This is determined by the seasonal distribution of rainfall.

降雨、径流和植被是红壤小流域土壤侵蚀的主要影响因素。

The CO2 uptake rate of plants is affected by the plant species and environmental conditions such as photosynthetically active radiation, temperature, water and nutrient contents. PAR is the most immediate environmental control on photosynthesis while air temperature affects both photorespiration and dark respiration. In the natural condition, PAR and temperature play an important role in net CO2 uptake. The effects of PAR and air temperature on the CO2 uptake of Pterocarpus macrocarpus grown in a natural habitat were studied in the present work. Due to many uncontrollable factors, a simple rectangular hyperbola could not represent the measured data. The data were divided into groups of 2℃ intervals; CO2 uptake in each group may then be related to PAR by a rectangular hyperbola function. Using the obtained functions, the effect of PAR was removed from the original data.

用涡度相关法对亚热带红壤丘陵区人工针叶林的二氧化碳、水、热通量进行了观测,重点分析了23m、39m两层高度的观测结果,同时把观测期分为春季和冬季两个不同时间段作了对比:结果表明,不管冬季还是春季,39m高度所测的总通量值和夜间通量值都要小于23m的观测值,这种通量差别表明:23m高度的观测结果更接近当地生态系统与大气之间的通量交换值,在此种生态类型条件下用涡度相关法测碳通量时,在23m、39m两层高度之间仍然存在大气平流现象;该试验区植被在冬季仍然可以进行光合作用,而且光合作用所吸收的CO2大于呼吸作用所排放的CO2,因此该种生态系统在冬季仍表现为碳汇;春季的碳通量值为冬季的2倍以上。

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