生物量

The 10 a plot had the highest community average height, abundance, and above ground biomass, but the community average increased with enclosure time and the 25 a plot had the highest community average coverage. Enclosure for 10 a gave the highest species diversity index in the third plots, while 15 a had the highest' richness index and lowest evenness index. The highest evenness index was in the non-enclosure plot. Exclosure appears to maintain or conserve, rather than increase plant diversity in contrast to non-enclosure.

结果表明，围封10年样地群落的高度、多度以及地上生物量最大，而群落的盖度则随封育年限的增加呈显著增加趋势，在封育25年达到最大；围栏封育的不同年限也显著影响了群落的物种多样性，在围封10年样地群落具有最高的多样性指数，围封15年样地具有最高的丰富度指数，而均匀度指数则是在未封育群落中表现为最高值，最低值是在物种丰富度最高时出现。

The dynamic changes in community height, coverage, abundance, above ground biomass and plant diversity in Stipa bungeana typical steppe was investigated by a quadrat method. There were six treatments: Unexclosure, 5-year old exclosure (5 a), 10-year old exclosure (10 a), 15-year old exclosure (15 a), 20-year old exclosure (20 a), and 25-year old exclosure (25 a) plots.

采用样方法对云雾山干草原区本氏针茅草地群落进行长期定位监测，对未封育样地和封育5，10，15，20和25年样地群落的平均高度、盖度、多度和地上生物量以及植物多样性进行实地调查分析，以研究围栏封育对草地植物群落特征动态变化的影响。

2After the utilization of seasonal exclosure, the proportion of coarse sand (2.00～0.25 mm) dropped significantly, and the proportion of fine sand (0.25～0.05mm) and silt and clay (.05mm) increased significantly, soil bulk density and compaction dropped, soil porosity, nutrient and microbe quantity increased, soil microbial biomass and enzyme activity enhanced in the layer of 0～10cm and 10～20cm.

2放牧草地采用生长季围封恢复措施后，土壤0～10cm、10～20cm土层中粗沙(2.00～0.25 mm)含量显著降低，细沙(0.25～0.05mm)和粉粘粒(。05mm)含量显著增加，土壤容重和紧实度降低，土壤孔隙度、养分含量、微生物数量、微生物生物量碳、氮含量增加，土壤酶活性增强。

In secondary forest, Acacia auriculaeformis and Pinus massoniana communities gaps, the biomass of the two exotics were higher than that of the native.

在林窗中，大叶相思和尾叶桉两种幼苗比荷木幼苗生长快，而且前两者的生物量都大于后者。

Based on a long-term experiment, the soil organic carbon, readily oxidizable carbon and microbial biomass carbon of two sequence rotation systems with spring wheat and field pea in soil layer under different tillage patterns were studied.

以长期定位试验为基础，对麦－豆轮作次序下不同耕作措施间的土壤有机碳、易氧化碳以及微生物生物量碳进行了测定，计算了土壤微生物商在各个序列中变化并对土壤各级有机碳库进行了相关分析。

Available plant biomass supplied by environment was estimated based on the main food availability in moose winter habitat. According to the field investigation, moose main food in this area includes poplar, willow, birch and filbert.

环境所提供的可食生物量的估计基于驼鹿的冬季生境所提供的主要食物的可获得量，根据野外调查，确定在该区驼鹿冬季的主要食物为：杨、柳、桦和榛。

Though the fish biomass method is usually adaptive to large floodplain river, it should be used with cautions for the small stream in mountains.

而鱼类生物量方法，一般适用于较大的平原型河流，对于较小的山区河流，该方法需慎重使用。

By the use of the principles and methods of fractal geometry, the morphological character and biomass of?

应用分形几何学的原理和方法对木榄幼苗的形态特征和生物量进行了研究。

This paper has applied a new approach, known as the fugacity approach, to study the relation between POPs and algae biomass .

本文以太湖为研究对象，应用逸度方法研究不同藻类生物量对 p，p′- DDT、六氯苯和六六六在太湖沉积相和水相中分布的影响。

Beauv effectively, and bensulfuron methyl (30g/hm^2) applied 6 d after rice transplanting could significantly reduce the plant numbers and biomass accumulation of difformed galingale (Cyperus difformis L.) and procumbent falsepimperne . The control efficiency of Huakangcao 78 and Yangdao 6 were 89.16% and 81.86% on barnyardgrass dry weight respectively 50 d after the rice transplanting, 83.56% and 84.93% on difformed galingale dry weight, 95.22% and 88.04% on procumbent falsepimperne dry weight. As a whole, the total dry weight control efficiency were 87.68% and 82.69% on above weeds correspondingly. Moreover, the grain yield of Huakangcao 78 and Yangdao 6 under the condition of 10cm depth water and herbicide application increased 40.33% and 21.36% comparing those under the treatment of 5cm depth water and no herbicide application respectively.

结果表明，水稻化感作用结合深水层可有效抑制稗草的萌发和生长，同时水稻移栽后6d使用苄嘧磺隆(30g/hm^2)单剂处理，明显地抑制了异型莎草和陌上菜的萌发数量和生物量积累；水稻移栽后50d，华抗草78和扬稻6号对稗草的干重防效分别为89.16%和81.86%，对异型莎草的干重防效分别为83.56%和84.93%，对陌上菜干重防效分别为95.22%和88.04%，对这3种杂草的总干重防效分别为87.68%和82.69%；10cm深水层及施用苄嘧磺隆单剂条件下2个水稻品种的产量比5cm水层、不施化学除草剂的处理分别增产40.33%和21.36%。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。