查询词典 succession of crops

For forest, grassland and river ecosystems, phreatophyte should be applied to, promoting the primary succession of the ecosystem. For farm and urban ecosystems, the main crops and pollution-resisting ornamental plants should be selected for the purpose of agricultural production, landscapes construction and bioremediation so as to control the speed and direction of secondary succession of these ecosystems.

对于森林、草地、江河等自然生态系统，植被选择应以原生种类为主，以促进生态系统进行原生演替；而农田、城市绿地生态系统，植被恢复应以生产生活、景观营造、生物修复为目的，宜选择当地主要优势农作物、观赏性好、抗污染的植物，以控制生态系统次生演替的方向和速度。

The soil environment of solar greenhouse deteriorate with the growing ages increased and this causes the obstacle matters in soil of succession planting cucumber, mainly perform as soil physicochemical properties worsening, soil hypo-salinization, soil acidification. To solve these problems, corn and spring onion as catch crops were planted in summer after cucumber harvest that based on having no effect on cucumber production in solar greenhouse.. The experiment researched the effect of different catch crops on cucumber yield and soil physicochemical properties.

针对日光温室黄瓜生产中存在土壤理化性状劣化、土壤板结、盐渍化、酸化等土壤退化问题，在保证黄瓜产量的前提下，夏季休闲期选择玉米、大葱作为填闲作物，以农民传统的常规休闲作为参比对象，研究玉米、大葱对保护地土壤理化性状以及对黄瓜产量的影响。

With the deflected succession of aquatic ecotype plant functional group,the dominance of mesophytes and xerophytes increased,while the dominance of aquatic and hygric plants decreased. However,there are only planting crops in the reclaimed wetland. In the composition of plant biotype functional group,the hydrophytes reduced quickly with the deflected succession and the dominance of perennial herbs is mostly marked,and there are only annual herbs in reclaimed wetland. Compared with primary swamp,the species diversity index of meadow is the highest,the swampy meadow follows,and the reclaimed wetland is the lowest.

植物的水分生态型功能群组成随湿地的逆行演替，水生、湿生类植物功能群的优势度不断减少，中生、旱生类植物功能群的优势度逐步增加，而在垦后湿地只有农作物；植物生活型功能群组成随湿地的逆行演替，水生草本迅速减少，陆生多年生草本增加占据优势，而在垦后湿地均为一年生草本；湿地植物物种丰富度、多样性指数由原生沼泽、沼泽化草甸到草甸依次增加，草甸为最大值，而垦后湿地则最低。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。