生物量

With adjacent semi-moving dune as the control, this paper studied the effects of 5-, 10- and 22-year old Hedysarum fruticosum plantations on the nutrient status, microbial biomass, and enzyme activities at the soil depths 0-10, 10-20 and 20-30 cm.

以半流动沙丘为对照，对5、10和22年生山竹岩黄蓍人工固沙群落不同层次（0～10、10～20 和 20～30 cm）土壤的养分状况、微生物生物量和土壤酶活性进行了对比研究。

G.E. Hubb has abundant toots and high yield, and the time when Eulaliopsis binata G.E. Hubb growths fast is as the same as the time of the rainy season in this area, so Eulaliopsis binata Retz.

蓑草根系发达，地上部生物量大，对土壤的覆盖保护好，且其生长盛期与降雨高峰同步，具有显著的水土流失防治效果。

In chapter 6, the foraging behaviour, biomass allocation and reproductive characteristics of Humulus scandens which grow under different nutrient supply were studied.

第六章以攀援植物葎草为材料，探讨了在不同养分供应水平下植株的觅食行为、生物量分配以及繁殖特性。

The results indicated that vegetation biomass had a significant positive relationship with vegetation coverage. They had a significant negative correlation with bulk density of soil, and a positive correlation with macroaggregate, water stability macroaggregate, organic matter content, total nitrogen content, hydrolyzable nitrogen content, available kalium content, microbial biomass, and microbial respiration. However, they had no significant relationship with total phosphorus and available phosphorus.

在其恢复过程中，植被地上生物量与植被覆盖度呈正相关，它们与土壤容重呈负相关，而与土壤大团聚体、水稳性大团聚体、有机质含量、全氮含量、水解氮含量、速效钾含量、微生物量以及土壤呼吸强度之间呈正相关，与土壤全磷、速效磷含量无显著相关性。

Hygrophilous species disappeared partly, and disturbance-resistant species and exotic species expanded their populations in the tourism area;(2) the community structure of bryophytes on the fir trunks in the tourism area was found simpler than that in the undisturbed area; and (3) the trunk at height of 120~180cm was more susceptible to disturbance, but the base was not affected signif icantly by disturbance.

在旅游活动频繁地段，耐荫喜湿物种局部消失，耐干旱抗干扰的植物种群扩大；(2)旅游活动频繁地段树干附生苔藓植物的丰富度、盖度和生物量较未扰动地段小；(3)距地面较高的高度120cm和180cm处受到的干扰强度最大，基部的影响较小。

And then analyze the characteristic of a hypaethral quarry and some ecological and environmental impact brought by opencast working. Such as some familiar pollute source, harms brought by opencast working: botanic reakage, water pollution, edaphic reakage, water and soil loss, biomass reduce.

然后对露天采石场的特点以及开采造成的生态环境影响进行分析，如一些常见的污染源，开采造成的危害：植被破坏、水体污染、土壤破坏、水土流失、生物量减少等。

The results showed that biomass of Eucalyptus exserta stands were increscent with the increasing of stand age.It was 2.77 t/hm2 in the stand of 0.7 year and was 70.932 t/hm2 in the stand of 7.7 years.

结果表明，窿缘桉林分的生物量是随着林分年龄的增长而增加，即由造林初期(0.7 a生)的2.77 t/hm2增加到主伐期(7.7 a生)的70.932 t/hm2。

In this paper,the effect of the compound stress of Cu,Cd,Pb,Zn and As on the growth and the accumulation and the distribution of heavy metals in Juncus Effuses is researched by using soil cultures method.

盆栽试验结果表明：Cd、Pb、Cu、Zn、As 5种重金属复合胁迫对灯心草地上部生长有一定程度的抑制作用，在土壤环境质量二级标准上限值处灯心草地上部生物量减产9。

The yield of biomass of the ground part of Juncus Effuses growing on the soil polluted by wastewater or tailings of Lead/Zinc mining decareasd by 28.23% or 37.1% respectively, but the activities of POD, SOD and CAT were all higher than those in CK.

生长在矿毒水和铅锌尾矿污染土壤中的灯心草地上部生物量分别下降28.23%和37.1%，但POD、SOD和CAT 3种酶活性均高于对照。

We also inoculated cottonwood clone 895 with 6 ectomycorrhizal fungi. It was found that Xerocomus chrysenteron, Lactarius insulsus and Boletus edulis accelerated seedlings generation from cuttings of clone 895 more than the other fungi did, and they remarkably promoted seedling growth comparing with the control. Lactarius insulsus promoted above-ground biomass and root system most effectively.

接种南林－895杨的6种菌根真菌中，红绒盖牛肝菌、劣味乳菇、美味牛肝菌可促进南林－895杨扦插苗提早萌芽，处理120 d后能显著促进南林－895杨苗的生长，与对照比较差异显著，其中劣味乳菇对杨苗生物量影响最大，其接种试验苗根系最为发达。

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。