生物量

Vegetation ecotype tend to be xerophyte and even hyper-xerophyte and finally replaced by annual plant. Community structure and species diversity also decrease as the ecological environment worsen, In this process, the height, coverage and biomass decreases by 56.6%、 80.8% and 74.2% respectively compared to steppe, and the indices of species richness, diversity and evenness decrease by 76.4%、 56.7% and 32.0%, but β diversity indices increase by 14.6 times, especially the decease of species gregariousness and the breadth and overlay of species Niche shows that grassland tend to be more sandy and vegetation retrogression succession take place.

其中，植被生态型逐渐由中旱生向旱生、超旱生过渡，并最终被一年生植被替代；群落结构及多样性呈明显递减规律，到严重沙化阶段，草群高度、盖度、生物量与典型草原相比，下降幅度分别达到56.6%、80.8%和74.2%；物种丰富度、多样性及均匀性分别降低76.4%、56.7%和32.0%；而群落β多样性增长14.6倍，特别是多年生物种群聚度降低和生态位宽度、生态位重叠值的下降，表明草地沙化，植被发生逆行演替。

The b value in the function expressed growth rate of biomass and width of leaf.

方程中的b值表示叶生物量或叶宽的增加速率。

Hame T A new methodology for the estimation of biomass of conifer dominated boreal forest using NOAA AVHRR data International Journal of Remote Sensing , 1997,15

戴小华%余世孝遥感技术支持下的植被生产力与生物量研究进展 10.3321/j.issn：1000-4890.2004.04.020 生态学杂志， 2004，04

I determined that densities and biomass of herbivorous mammals in Nagarahole were comparable to some of the best East African Savannah areas.

我在这里发现，食草哺乳动物的种群密度与生物量，堪与状况最好的东非大草原地区相比。

Secondary production is defined as the rate of production of new biomass by heterotrophic organisms.

次级生产力的定义是异养有机体的新生物量的生产速率。

Secondary production Secondary production is defined as the rate of production of new biomass by heterotrophic organisms.

次级生产力次级生产力的定义是异养有机体的新生物量的生产速率。

In contrast, cucumber and melon plants showed the highest dry weight, P_ and g_s at 24°C. The decreases in P_ were mainly due to the decrease in stomatal conductance.

与这两组植物表现不同的是，组Ⅱ是在中温处理的24℃时显示出其最大的生物量、P_与g_s.P_的变化主要是缘于g_s的相应变化。

Densities of over 60 hoofed animals for every square kilometre, adding up to a live animal biomass of 15,000 kilograms.

每平方千米有蹄类动物的数量超过60只，加起来的活动物生物量可达15 000千克。

By using four sample fields in Jiusheng village, Sandao town and Baiquan county, the paper studied the effects of different windbreak belt structures in hummock and hill district on biodiversity by means of the index, such as species richness , diversity index and biomass.

文章以拜泉县三道镇久胜村的4块样地为例，从物种丰富度指数、多样性指数、生物量等方面研究了漫岗丘陵区不同防护林结构对林下植物生物多样性的影响。

Tree's volume; biomass; nonlinear least-squares regression; power function model; hyperbolic function model

材积；生物量；非线性最小二乘回归；幂函数模型；双曲函数模型

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。