土壤水肥作用对胡杨幼苗生长特性的影响研究
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摘要
结合胡杨林更新制约因素水肥问题,采用控制实验的方法,分析水肥对胡杨幼苗生长特征的影响。研究结果表明:水肥均能对胡杨幼苗的生长起到非常重要的作用,且水肥交互作用使幼苗响应变得复杂;一定浓度的氮肥能提高胡杨的生产能力,但受到水分的制约,断续给水处理下,氮肥浓度的增加反而会导致比叶面积减少;断续给水模式更有利于幼苗生物量积累,能促进胡杨对地下生物量的投入,使其对水资源竞争力得到提高;根冠比随水分增加而减少,表明水分过高不利于胡杨幼苗的生长;综合来看,含水率为15%~30%、含氮量为2 g/L施肥量的土壤比较适合胡杨幼苗生长。
The controlled experiment with soil water and fertilizer was conducted to explore the effect of water and fertilizer on the growth characteristics of Populus euphratica seedling. The results showed that both water and fertilizer had significant influence on the growth of Populus euphratica seedlings. The certain concentration of nitrogen fertilizer improved the productivity of P. euphratica but the effect was limited by water. The increase of nitrogen fertilizer concentration resulted in the decrease of specific leaf area with the intermittent water supply model which was promoted the accumulation of seedling biomass,the investment of underground biomass and the competitiveness for water resources. The root-crown ratio decreased with the increase of water,indicating that too much water was not conducive to the growth of seedlings. The soil with water content of 15% ~ 30% and nitrogen content of 2 g/L was more suitable for the growth of P. euphratica seedlings.
The controlled experiment with soil water and fertilizer was conducted to explore the effect of water and fertilizer on the growth characteristics of Populus euphratica seedling. The results showed that both water and fertilizer had significant influence on the growth of Populus euphratica seedlings. The certain concentration of nitrogen fertilizer improved the productivity of P. euphratica but the effect was limited by water. The increase of nitrogen fertilizer concentration resulted in the decrease of specific leaf area with the intermittent water supply model which was promoted the accumulation of seedling biomass,the investment of underground biomass and the competitiveness for water resources. The root-crown ratio decreased with the increase of water,indicating that too much water was not conducive to the growth of seedlings. The soil with water content of 15% ~ 30% and nitrogen content of 2 g/L was more suitable for the growth of P. euphratica seedlings.
引文
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[7]张玉波,李景文,张昊,等.胡杨种子散布的时空分布格局[J].生态学报,2005,25(8):1994-2000.
[8]张玉波,李景文.额济纳胡杨有性繁殖失败因素分析[J].科学技术与工程,2005,8(5):467-472.
[9]闫巧玲,刘志民,骆永明.科尔沁沙地78种植物繁殖体重量和形状比较[J].生态学报,2004,24(11):2422-2429.
[10]DAVID A,LYTLE N,LEROY P.Adaptation to natural flow regimes[J].Ecology and Evolution,2004,19(2):94-99.
[11]FREAS K E,KEMP P R.Some relationships between environmental reliability and seed dormancy in desert annual plants[J].Journal of Ecology,1983(71):211-217.
[12]KOPPEL J,RIDTKERK M.Spatial interaction and resilience in the arid ecosystems[J].The American Naturalist,2004,163(1):113-121.
[2]李俊清,崔国发.西北干旱半干旱地区天然林保护与退化生态系统恢复措施思考[J].北京林业大学学报,2000,22(4):1-7.
[3]方创琳.河西走廊绿洲生态系统的动态模拟研究[J].生态学报,1996,16(4):389-398.
[4]高瑞如,黄培祐,赵瑞华.胡杨种子萌发及幼苗生长适应机制研究[J].淮北煤炭师范学院学报,2004,25(2):47-50.
[5]华鹏.胡杨实生苗在河漫滩自然发生和初期生长的研究[J].新疆环境保护,2003,25(4):14-17.
[6]李利,张希明,何兴元.胡杨种子萌发和胚根生长对环境因子变化的响应[J].干旱区研究,2005,22(4):520-525.
[7]张玉波,李景文,张昊,等.胡杨种子散布的时空分布格局[J].生态学报,2005,25(8):1994-2000.
[8]张玉波,李景文.额济纳胡杨有性繁殖失败因素分析[J].科学技术与工程,2005,8(5):467-472.
[9]闫巧玲,刘志民,骆永明.科尔沁沙地78种植物繁殖体重量和形状比较[J].生态学报,2004,24(11):2422-2429.
[10]DAVID A,LYTLE N,LEROY P.Adaptation to natural flow regimes[J].Ecology and Evolution,2004,19(2):94-99.
[11]FREAS K E,KEMP P R.Some relationships between environmental reliability and seed dormancy in desert annual plants[J].Journal of Ecology,1983(71):211-217.
[12]KOPPEL J,RIDTKERK M.Spatial interaction and resilience in the arid ecosystems[J].The American Naturalist,2004,163(1):113-121.