Response of photosynthesis, morphology and growth of edysarum mongolicum seedlings to simulated precipitation change in Maowusu sandland

Response patters were investigated for seedlings of Hedysarum mongolicum, a dominant shrub in Maowusu sandland, to the simulated precipitation change by artificially controlling water supply at four levels. Plant growth characters, in terms of branch number and length, leaf number and area, and biomass, increased while water supply increased. However, the effect of water supply on leaf photosynthetic rate was not significant. Root/shoot biomass ratio significantly decreased with the increase of water supply, which was considered adaptive distribution of biomass investments in the different water supply. Water supply obviously affected branching patter. Branch section number,branch number and length of the same section enhanced as water supply increased. Branch number and length were clearly positive correlation with total and aboveground biomass in four water supply treatments. Branch character fully showed plant growth.     

Response of photosynthesis,morphology and growth of Hedysarum mongolicum seedlings to simulated precipitation change in Maowusu sandland

ＩｎｔｒｏｄｕｃｔｉｏｎＭａｏｗｕｓｕｓａｎｄｌａｎｄ ,ａｓｅｍｉ ａｒｉｄａｒｅａｏｆＣｈｉｎａ,ｌｉｅｓｏｎｍｉｄｄｌｅｐａｒｔｏｆＣｈｉｎｅｓｅｎｏｒｔｈｄｅｓｅｒｔ (Ｙａｏ ,1 992 ) .Ａｔｐｒｅｓｅｎｔ,ｄｅｓｅｒｔｉｆｉｃａｔｉｏｎｉｓｂｅｃｏｍｉｎｇｍｏｒｅｓｅｒｉｏｕｓａｎｄｔｈｅｌａｎｄｓｃａｐｅｃｏｍｐｒｉｓｅｓｌａｒｇｅａｒｅａｓｏｆｓａｎｄ ｃｏｖｅｒｅｄｌａｎｄｔｈｅｒｅ(Ｚｈａｎ ,1 994;Ｃｈｉ,1 994) .Ｔｈｅｅｎｖｉｒｏｎｍｅｎｔｉｓｃｈａｒａｃｔｅｒｉｚｅｄｂｙｗａｔｅｒｓ…     

延津县沙荒地的开发与治理

本文客观地分析了延津县沙区的自然资源状况，开发潜力及存在的问题，提出了开发治理的方向和关键技术，为我国同类地区风沙化土地的开发治理提供了经验。     

毛乌素沙地灌木资源区系特征及其保护对策

本文基于对毛乌素沙地的植被调查,分析了该区灌木区系的科、属组成,地理成分,生活型和生态习性,以及灌丛在这一特殊地理生态过渡带的重要地位。在此基础上提出了灌木资源多样性保护和恢复的对策。     

Effect of different water supply on morphology, growth and photosynthetic characteristcs of Salix Psammophila seedlings in Maowusu sandland, China

ＩｎｔｒｏｄｕｃｔｉｏｎＩＰＣＣ (ＩｎｔｅｒｇｏｖｅｒｎｍｅｎｔａｌＰａｎｅｌｏｎＣｌｉｍａｔｅＣｈａｎｇｅ ,1990 ;1992 ;1995)ｈａｓｎｏｔｅｄｔｈａｔｈｕｍａｎａｃｔｉｖｉｔｉｅｓａｒｅｓｕｂｓｔａｎｔｉａｌｌｙｉｎｃｒｅａｓｉｎｇｔｈｅｅｍｉｓｓｉｏｎｓｏｆ“ｇｒｅｅｎｈｏｕｓｅｇａｓｅｓ”ｓｕｃｈａｓｃａｒｂｏｎｄｉｏｘｉｄｅ (ＣＯ2 ) ,ｍｅｔｈａｎｅ ,ｃｈｌｏｒｏｆｌｕｏｒｏｃａｒｂｏｎｓａｎｄｎｉｔｒｅｏｕｓｏｘｉｄｅｉｎｔｏｔｈｅａｔｍｏｓｐｈｅｒｅ .Ｔｈｅｓｅｉｎｃｒｅａｓｅｓｗｉｌ…