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.

對于森林一级片在哪里看、草地欧美一区二区在线高清网站、江河等自然生態(tài)系統(tǒng)，植被選擇應(yīng)以原生種類為主黄色视频清风阁，以促進(jìn)生態(tài)系統(tǒng)進(jìn)行原生演替av淘宝一区二区播放；而農(nóng)田、城市綠地生態(tài)系統(tǒng)国产一级中国美国毛片，植被恢復(fù)應(yīng)以生產(chǎn)生活亲近相奷中文字幕、景觀營造、生物修復(fù)為目的，宜選擇當(dāng)?shù)刂饕獌?yōu)勢農(nóng)作物一级作爱免费视频在线观看、觀賞性好另类自拍日韩在线视频观看、抗污染的植物，以控制生態(tài)系統(tǒng)次生演替的方向和速度91精品免费大秀。

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.

針對日光溫室黃瓜生產(chǎn)中存在土壤理化性狀劣化免费无码在线观看黄色视频、土壤板結(jié)精品911国产自产、鹽漬化无码高潮喷吹在线播放亚洲、酸化等土壤退化問題，在保證黃瓜產(chǎn)量的前提下日本一区二区人妻在线视频，夏季休閑期選擇玉米www,av免费、大蔥作為填閑作物，以農(nóng)民傳統(tǒng)的常規(guī)休閑作為參比對象欧美激情1级片，研究玉米免费看一级人妻片、大蔥對保護(hù)地土壤理化性狀以及對黃瓜產(chǎn)量的影響。

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.

植物的水分生態(tài)型功能群組成隨濕地的逆行演替91自拍偷拍首页，水生精品偷拍欧美日韩视频网站免费、濕生類植物功能群的優(yōu)勢度不斷減少，中生小黄片18禁、旱生類植物功能群的優(yōu)勢度逐步增加在线a毛片免费视频观看APP，而在墾后濕地只有農(nóng)作物；植物生活型功能群組成隨濕地的逆行演替午夜久久三级片，水生草本迅速減少色色www永久免费视频，陸生多年生草本增加占據(jù)優(yōu)勢，而在墾后濕地均為一年生草本最新欧美性爱COm485在线视频；濕地植物物種豐富度欧美黄色网站免费在线看、多樣性指數(shù)由原生沼澤、沼澤化草甸到草甸依次增加自慰喷水网站入口，草甸為最大值538在线视频观看，而墾后濕地則最低。