水曲柳和落叶松人工林根系分解与养分释放

应用生态学报

水曲柳和落叶松人工林根系分解与养分释放

张秀娟^1,2;吴楚²;梅莉¹;韩有志^1,3;王政权¹

¹东北林业大学林学院, 哈尔滨 150040; ²长江大学园艺园林学院, 荆州 434023; ³山西农业大学林学院, 太谷 030801

收稿日期:2005-08-12 修回日期:2006-05-30 出版日期:2006-08-18 发布日期:2006-08-18

Root decomposition and nutrient release of Fraxinus manshurica and Larix gmelinii plantations

ZHANG Xiujuan^1,2; WU Chu²; MEI Li¹; HAN Youzhi^1,3; WANG Zhengquan¹

¹School of Forestry, Northeast Forestry University, Harbin 150040, China; ²College of Horticulture and Gardening, Yangtze University, Jingzhou 434023, China; ³College of Forestry, Shanxi Agricultural University, Taigu 030801, China

Received:2005-08-12 Revised:2006-05-30 Online:2006-08-18 Published:2006-08-18

摘要/Abstract

摘要： 采用埋袋法对水曲柳和落叶松粗根(5～10 mm)、中根(2～5 mm)、细根(＜2 mm)的分解速率及其养分释放进行了为期2年的研究.结果表明,水曲柳粗根、中根和细根年分解系数分别为0.3649、0.4381和0.2720,落叶松依次分别为0.1967、0.1955和0.2464.通过养分分析发现,根系分解过程释放大量C和养分.分解150 d后,两树种所有级别根系的可溶性糖释放均超过90%.水曲柳粗根和中根K的释放均在40%左右,细根K的释放为71%,落叶松所有级别的根系K的释放均在95%以上.在根系分解第2年,两树种粗根和中根N的释放在50%左右波动,P在40%左右波动,两树种细根N和P的释放均达到60%.因此,根系分解在C和养分循环中起重要作用,如果将其忽略,土壤有机质和养分元素的循环将会被严重低估.

关键词: AM真菌, 施P量, 生长量, 化学成分, 烟叶

Abstract: A two-year buried bag experiment with different sizes of Fraxinus mandshurica and Larix gmelinii roots showed that the coarse (5～10 mm), medium (2～5 mm) and fine (＜2 mm) roots of F. mandshurica had an annual decomposition coefficient of 0.3649, 0.4381 and 0.2720, while those of L. gmelinii had the coefficient of 0.1967, 0.1955 and 0.2464, respectively. During root decomposition, large amounts of carbon and nutrients released. After buried into soil for 150 days, more than 90% of soluble sugar in all sizes of the two species roots was released, and about 40%, 71% and 95% of potassium was released from the coarse and medium, and fine roots of F. mandshurica, and all sizes of L. gmelinii roots, respectively. In the second year of the experiment, about 50% of nitrogen and 40% of phosphorus were released from the coarse and medium roots of the two species, and 60% of nitrogen and phosphorus were released from their fine roots. In the study of forest ecosystem’s carbon and nutrient cycles, root decomposition shouldn’t be ignored.

Key words: AM fungi, P applied levels, Growth amount, Ch emical composition, Tobacco leaf

张秀娟^1,2;吴楚²;梅莉¹;韩有志^1,3;王政权¹. 水曲柳和落叶松人工林根系分解与养分释放[J]. 应用生态学报.

ZHANG Xiujuan^1,2; WU Chu²; MEI Li¹; HAN Youzhi^1,3; WANG Zhengquan¹ . Root decomposition and nutrient release of Fraxinus manshurica and Larix gmelinii plantations[J]. Chinese Journal of Applied Ecology.

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