城乡链接与农民合作

2009-2010 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

待补充

Effects of sintering temperature on properties of dual-phase oxyge

Effects of different restoration ages on plant diversity and community stability of wetlands in the Yellow River Delta

Ecological restoration is an efficient method to reduce the degradation of natural coastal wetlands.Restoration age has important effects on soil chemical properties and plant community characteristics.However,long-term monitoring on the effects of wetland restoration projects and their underlying mechanism is still limited.Here,we examined the effects of different restoration ages (0,3,7,10,and 19 years) of wetlands on soil properties,plant species diversity,and community stability in the Yellow River Delta.The results showed that soil electric conductivity,available phosphorus concentration,and available potassium concentration decreased with increasing restoration age.However,soil available nitrogen concentration increased during the restoration process.Shannon index,Pielou evenness index,and species richness index of plant communities increased continuously with increasing restoration age,while plant diversity indices were mainly driven by the changes in soil electrical conductivity.In addition,restoration age also promoted plant community stability,which was significantly and negatively related to soil electric conductivity,available phosphorus and available potassium,and positively related to available nitrogen concentration.With the proceeding of restoration,soil environment and plant community structure improved continuously.Therefore,restoration projects can stimulate positive succession of community and improve the stability of coastal wetland ecosystems

驼绒藜属牧草种子生物学特性、种子生产技术及基地建设

该项研究针对具有广泛开发利用前景的驼绒藜属牧草种子存在的寿命短，易于劣变等问题进行了种子生物学特性的系统研究，包括种子的发育、萌发、贮藏、活力、营养代谢和激素调节、抗逆性以及遗传差异等；探索了驼绒藜属植物“短命种子”的发育规律和劣变机理，提出的种子超干燥贮藏技术具有创新性；首次系统研究并提出的驼绒藜属种子生产和贮藏技术体系，可提高种子产量3～5倍，延长种子寿命1～2年，秋季种苗移栽定植技术成活率达80%以上，比传统技术提高50%以上；建立了华北驼绒藜人工种子生产基地1000亩、天然种群原种基地2000亩，年产种子15吨，对恢复和保护利用驼绒藜属植物资源具有重要意义