【摘要】 对合川市紫色土区7种农林复合经营模式的土壤理化性状进行了试验研究,结果表明:与纯林相比,农林复合生态系统能够有效地改善土壤养分在垂直空间上的分布,对不同深度土壤的理化性状均有所改善,特别是20~40 cm土层;不同复合年限的系统对土壤的改良效果不同,复合4年的枇杷—西瓜复合系统效果明显好于复合2年的系统,前者0~20 cm土层的全N含量比后者高41.67%,20~40 cm土层的有机质含量比后者高43.23%,40~60 cm土层的全K含量高23.41%;不同复合品种的系统同样也有不同的效果,柚子—苋菜系统对土壤物理性质的改良效果最好,该系统土壤中的N素和P素含量高于柚子—粉葛系统,K素含量则低于柚子—粉葛系统,而柚子—玉米复合系统对土壤的改良效果总体上不如前两个系统。更多还原

【Abstract】 Soil property of seven agroforestry systems were conducted in purple soil region of Hechuan.The results show that:compared with pure forest,agroforestry systems can availably change the vertical distribution of soil nutrient and improve soil physical and chemical properties in different soil depth especially in 20~40 cm;the effect of soil improvement is vary with composite time,Loquat-Watermelon system has been managed for 4 years is better than the one has been managed for 2 years,total nitrogen in 0～20 cm of the first system is increased 41.67% times over that of the latter,organic matter in 20～40 cm is increased 43.23%,and total kalium is inceased 23.41%;intercropping variety also affect the effect,Grapefruit-Edible Amaranth is the best one of the three agroforestry systems in improving soil physical properties,and its soil N and P contents are higher than Grapefruit-Radix Puerariae system,but K content is lower.Grapefruit-Corn system is inferior to Grapefruit-Radix Puerariae system、Grapefruit-Edible Amaranth system as a whole.更多还原