水土保持学报2011，Vol.25Issue(5)：161-167,7.
苹果酸/盐对暗棕壤磷有效性及林木吸收磷的影响
Effects of Malic Acid/Malate on Phosphorus Availability of Dark Brown Forest Soils and Absorption of Forest Seedlings
摘要
Abstract
By simulating malic acid/malate contents in forest litter leachates,the effects and mechanism of different concentrations of malic acid/malate solutions on phosphorus（P） availability of air-dry dark brown forest soils were studied.By pot experiments,the role of malic acid/malate solutions on solublizing P were validated in natural dark brown forest soils,and the effects of malic acid/malate on P absorption of Larix olgensis and Fraxinus mandshurica seedlings were also discussed.The results showed that,malic acid and malate substantially encouraged soil P release of air-dry A1 and B horizons soils,and dissolved P contents increased with the extractant concentrations,but the effects on B horizon were relatively weak.Malate solutions had much higher soil-P-release efficiency than that of malic acid at the same concentration,therefore,the mechanisms for malic acid and malate to solublize P should be dominated by reactions of malate anion.The effects of malate anion on P release was found to be cumulative,and the amount of P released was primarily controlled by cumulative malate loading rate.When malate anion was loaded as sodium malate solutions,the regression equation between A1 horizon P release and cumulative malic loading rate was：Y=-0.0005X2＋0.1929X＋1.8192,R2=0.959 3.Merely on a quantitative basis of malate anion leached from forest litter,the increased P release from A1 horizon was estimated to be 3.04 kg/（hm2·a）,accounting for 1/4~1/3 of the annual P absorption in middle-aged forests.The results of natural dark brown forest soils＇ experiments also showed that,malic acid/malate solutions of appropriate concentrations could stimulate soil P release,and were also helpful for P absorption of Fraxinus mandshurica and Larix olgensis seedings.In the processes of P mobilization and absorption,the concentration of 1.0 mmol/L or 5.0 mmol/L had the best function,and malate was better than malic acid.关键词
苹果酸/苹果酸盐/暗棕壤/磷/落叶松/水曲柳Key words
malic acid/malate/dark brown forest soils/phosphorus/Larix olgensis/Fraxinus mandshurica分类
农业科技引用本文复制引用
宋金凤,宋俊杰,褚永磊,王勇,崔晓阳,彭红梅..苹果酸/盐对暗棕壤磷有效性及林木吸收磷的影响[J].水土保持学报,2011,25(5):161-167,7.基金项目
国家自然科学基金项目 （）
中国博士后科学基金特别资助项目 （）
东北林业大学本科生创新性实验项目 （）
