土壤保持

Due to the divergence in valuation theory and methods,the results of the studies are not accepted in practices.

研究结果表明，鹞落坪自然保护区在保持土壤、涵养水源、固定CO2、营养物质循环、降解污染物和防治病虫害、鼠害方面所产生的经济价值为2.55亿元。

One important form of soil conservation is the use of windbreak windbreaks .

其中一种重要的保持土壤的方式就是防风林。

The achievement of this project can be briefly summed up as following:(1)the carbon contributing to karst processes mainly comes from ecological system itself under the condition of existence of vegetation and soil covers;(2)results indicates that the depositing processes of rainfall to CO2 is an important "sink" to global carbon cycle;(3)owing to the differences of vegetation and surface covering, the adjusting effect of ecosystem to environmental humidity, temperature and CO2 concentration near surface air which indicates different benefit of preventing water and soil from lose is marked;(4)the preponderant species of vegetation in the karst ecosystems which have different kinds of carbonate rocks are obviously variant, and this situation results to the clearly differences of the micro － habitat , structure of surface cover and water holding capacity;(5) the relevant study showed that the carpophagous animals and birds make a important role in the spreading of vegetation seeds. The designed experience for the study of seed reservoir was not able to obtain a satisfactory result.

主要研究成果包括：通过对表层系统碳库的研究，认为在有土壤和植被覆盖时，岩溶作用过程中的碳主要来自生态系统本身而不是母岩；降雨对大气碳具有重要&沉淀&作用，是碳的一个重要汇；不同植被类型表层岩溶系统对系统水份、空气湿度、气温、土温和近地表 CO2浓度等具有明显调节作用，具有不同的水土保持效益；不同母岩的岩溶生态系统的植被优势种、属差异明显，由此形成的小生境、地被物及其持水性差异巨大；对典型岩溶表层系统种子库的试验研究没有取得满意结果，但食果动物、鸟类对种子传播起到一定作用。

As important forage crops, legumes of the genus Chamaecrista play an important role on soil improvement, water and soil conservation, etc.

摘要决明属牧草既是重要的饲料作物，又在土壤改良、水土保持等多方面发挥着积极作用。

A P enrichment treatment was carried out in the greenhouse simultaneously. 300ppm P as monocalcium phosphate were applied in each of these eight soils and kept in field capacity for 5 months.

採取本省中、南部代表性石灰质土壤八种，分别加入0、20及300ppm p后，置於塑胶罐中，保持田间容水量状態，以30℃定温孵育，定期取出测定其有效磷及无机磷型態。

Through comparison and analysis, it is believed that, compared to other methods of prediction, that of the demand for phosphatic fertilizers in China from the viewpoint of maintenance of soil fertility is more objective.

经过比较分析，认为与其它预测方法相比，从保持土壤肥力的角度预测中国磷肥需求更为客观。

The results show that buried depth of phreatic water levels has a very important influence on the agricultural environment and transformation between soil water and groundwater.

试验方法与试验条件概述在昌吉均衡试验场选用天山北麓平原有代表性的冬小麦和玉米两种主要作物，人为控制地下水位，模拟不同潜水埋深条件下的种植试验，土壤条件和灌溉制度与当地基本保持一致。

Farm. In the past (until app. 25 years ago) pistachiodiversity was maintained high in the field through a number of cultivation practices, s.a. use of male varieties derived from seed, use of wild Pistacia species to boost pollination and hence the fruit setting, use of natural populations of wild Pistacia (P. atlantica) as rootstock due to their well known resistance to stony and calcareous soils.

最近在农场栽培无花果技术的改变更加导致作物的多样性减少。25年前，无花果多样性通过多种栽培保持在很高的水平（源于种子的雄性物种采用，野生开心果物种改善授粉的采用，自然野生开心果作为根茎的采用——因为他们已知很好的抵抗多石和石灰性土壤的能力，等等

Serious erosion of soil and water in refuse dump is key and main task of land restoration in open cast mine of steppe region, which induce salination and degradation of soil in surroundings.

沙棘是草原露天矿排土场理想的复垦植物，可以在短时期内形成郁闭的人工沙棘灌丛，土壤培肥和水土保持效果显著，并明显减缓坡下草场盐渍化程度。

These results suggested that higher concentration of NaCl could cause the seed dormancy and accelerate the germination of ungerminated seeds. Perhaps there was a mechanism that the seed coat or embryo could prevent Na~+ from entering into the embryo so as to keep higher K~+ and lower Na~+/K~+ in the embryo. And it might be one of the physical mechanisms that the seed of Hibiscus hamabo Sieb.et Zucc. could resist high salinity stress. In addition, the annual seedlings of Hibiscus hamabo Sieb.et Zucc.

上述结果表明：高浓度的盐可以诱导海滨木槿种子休眠并促进盐胁迫解除后种子的萌发，这种机制可以使之避开不良的萌发条件，等到降雨使土壤溶液浓度降低再萌发，这是盐生植物的种子适应盐渍生境的一种有效方式；海滨木槿的种皮有阻挡Na~+进入胚的作用或胚具有某种拒Na~+的机制，使胚保持较高含量的K~+和较低的Na~+/K~+，这可能是海滨木槿种子耐盐的主要生理原因之一。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失