土壤保持

Only keeping suitable SWC after anthesis and nitrogen fertilization can benefit the improvement of Amylopectin to Amylose ratio.

只有保持适宜的花后土壤含水量和施适宜的氮肥才有利于支/直比的提高。

The result shows, grass of Sikkim small hole is temporary decline Yan period with permanent decline water content of Yan period soil is respectively 7.06% be in temporary decline with 6.20%; the Sikkim of Yan period is small after water of Kong Cao answer bibulous and rapid, decline Yan condition is eliminated gradually, appearance of aftertreatment group of answer water 6 H and contrast active of basic consistent;SOD is during threatening processing with markedder than notting have to taking a picture change, the ascendant;CAT that there is certain range after answer water and POD active are in threatening during after rising first, drop, all remarkable prep above contrasts level, and the active;MDA content that still keeps taller after answer water as the extension of time of arid and threatening processing mushroom, to threatening the 8th climate reachs maximum, content of the MDA in the lamina after answer water drops quickly, arrive the 5th day after answer water, content of the MDA in threatening group lamina is adjacent already contrast level.

结果显示，锡金微孔草暂时萎焉期和永久萎焉期土壤含水量分别为7.06%和6.20%；处于暂时萎焉期的锡金微孔草复水后吸水迅速，萎焉状态逐渐消除，复水6 h后处理组外貌和对照基本一致；SOD活性在胁迫处理期间和对照相比无显著变化，复水后有一定幅度的上升；CAT和POD活性在胁迫期间先上升后下降，均显著高于对照水平，且复水后仍然保持较高的活性；MDA含量随着干旱胁迫处理时间的延长而迅速增加，到胁迫第8天时达到最大值，复水后叶片中MDA含量迅速下降，到复水后第5天，胁迫组叶片中MDA含量已接近对照水平。

Place burlap over the flat, water gently so as not to move the seeds, and keep the soil moist, but not soaking wet in temperatures between 75 and 85 degrees fahrenheit.

地方burlap以上的单位，水温柔地，使不提出种子，并保持土壤湿润，但不能浸泡在潮湿，气温介乎75和85华氏度。

When the CODcr concentration of chemical wastewater changes between 22.70mg per L and 951.48 mg per L, the clearing CODcr rate of soil stuffing columniation can keep over 60 percent.

实验废水CODcr浓度在22.70mg/L到951.48 mg/L之间变化，土壤填料柱对CODcr的去除率可保持60%以上。

The corm ' s position in the soil is often maintained with the aid of contractile roots.

在收缩根的帮助下球茎可以在土壤中保持一定的位置。

The mechanism of soil erosion at different degrees was expounded,which was caused by different cutting methods, skidding method s,and cutover land cleaning methods in forest operation techniques.

本文分析森林作业技术中不同采伐方式、集材方式和迹地清理方式造成的不同程度水土流失的机制，提出防止因森林作业而导致水土流失措施：合理选择采伐方式，避免大强度采伐，选择对土壤破坏小的集材方式，使剩余物对雨水保持截持作用的迹地清理方式。

Soil microbial biomass and activities of invertase and urease all tended to decrease after pot-culture experiment, while the correlations between these biochemical properties and field ages were similar to those before this experiment, suggesting that rice cultivation without fertilization consumed part of soil microbial biomass, decreased soil enzyme activities correlated with C and N transformation, and affected soil nutrients status disadvantageously.

温室盆栽试验之后，水稻土的微生物生物量及酶活性与利用年限之间的关系规律和种植水稻之前基本一致，且整体上又趋于下降，即无施肥条件下种植水稻转化利用了土壤部分微生物生物量，并减弱了与碳氮转化相关酶的活性，对保持水稻土的营养水平造成不利影响。

Classification of soil erosion is an important topic in soil and water conservation.

土壤侵蚀等级的确定是水土保持工作中的重要问题。

Soil erosion is an important topic in the planning of soil and water conservation in the urban area.

土壤侵蚀等级的确定是城市水土保持规划中的重要问题。

It's an effective way to maintain soil fertility .

这是保持土壤肥力的一个有效办法。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。