Zhang Xiujuan, Wu Chu, Mei Li, Han Youzhi, Wang Zhengquan
School of Forestry, Northeast Forestry University, Harbin 150040, China.
Ying Yong Sheng Tai Xue Bao. 2006 Aug;17(8):1370-6.
A two-year buried bag experiment with different sizes of Fraxinus mandshurica and Larix gmelinii roots showed that the coarse (5 to approximately 10 mm), medium (2 to approximately 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.
一项为期两年的埋袋实验，使用了不同大小的水曲柳和兴安落叶松根系，结果表明，水曲柳的粗根（5至约10毫米）、中根（2至约5毫米）和细根（<2毫米）的年分解系数分别为0.3649、0.4381和0.2720，而兴安落叶松的相应系数分别为0.1967、0.1955和0.2464。在根系分解过程中，大量的碳和养分被释放出来。埋入土壤150天后，两种树种所有大小根系中90%以上的可溶性糖被释放出来，水曲柳粗根和中根、细根以及兴安落叶松所有大小根系中分别约有40%、71%和95%的钾被释放出来。在实验的第二年，两种树种的粗根和中根中约50%的氮和40%的磷被释放出来，细根中60%的氮和磷被释放出来。在森林生态系统碳和养分循环的研究中，根系分解不容忽视。
