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    谷越, 王芳, 陈鹏狮, 张军辉, 韩士杰, 张雪, 陈志杰, 岳琳艳. 长期施氮和降水减少对长白山阔叶红松林凋落物量的影响[J]. 北京林业大学学报, 2017, 39(4): 29-37. DOI: 10.13332/j.1000-1522.20160171
    引用本文: 谷越, 王芳, 陈鹏狮, 张军辉, 韩士杰, 张雪, 陈志杰, 岳琳艳. 长期施氮和降水减少对长白山阔叶红松林凋落物量的影响[J]. 北京林业大学学报, 2017, 39(4): 29-37. DOI: 10.13332/j.1000-1522.20160171
    GU Yue, WANG Fang, CHEN Peng-shi, ZHANG Jun-hui, HAN Shi-jie, ZHANG Xue, CHEN Zhi-jie, YUE Lin-yan. Effects of long-term nitrogen addition and precipitation decreasing on the litterfall production of broadleaved Korean pine forest in Changbai Mountains of northeastern China.[J]. Journal of Beijing Forestry University, 2017, 39(4): 29-37. DOI: 10.13332/j.1000-1522.20160171
    Citation: GU Yue, WANG Fang, CHEN Peng-shi, ZHANG Jun-hui, HAN Shi-jie, ZHANG Xue, CHEN Zhi-jie, YUE Lin-yan. Effects of long-term nitrogen addition and precipitation decreasing on the litterfall production of broadleaved Korean pine forest in Changbai Mountains of northeastern China.[J]. Journal of Beijing Forestry University, 2017, 39(4): 29-37. DOI: 10.13332/j.1000-1522.20160171

    长期施氮和降水减少对长白山阔叶红松林凋落物量的影响

    Effects of long-term nitrogen addition and precipitation decreasing on the litterfall production of broadleaved Korean pine forest in Changbai Mountains of northeastern China.

    • 摘要: 为了解持续氮沉降和降水减少条件下森林群落凋落物的量变化及其时间动态,以长白山阔叶红松林为研究对象,利用收集器法于2015年生长季(6—10月)对长期氮添加和降水控制实验平台3种不同处理样地(对照、施氮和减水施氮)内的凋落物进行了研究。主要分为红松叶、蒙古栎叶、其他树种叶、花果皮屑、枝5部分。本研究将凋落系数作为衡量林分生产凋落物能力的大小,比较各处理间凋落物的“净”差异。结果显示:各处理样地生长季内叶凋落量所占比重较大,可达到79%~81%,而枝和花果皮屑所占比重为19%~21%;凋落节律呈单峰型,凋落量峰值主要集中在9—10月份,降水减少会使其他树种凋落物的凋落期提前;不同组分凋落物对氮水控制响应不同,氮添加显著降低红松叶凋落物产量,降雨减少显著提高了总叶凋落物产量,减水施氮显著提高了其他树种叶凋落产量,而氮水控制对蒙古栎、枝和花果皮凋落物产量影响不显著;氮添加会抑制针叶树种的凋落物量,促进阔叶树种的凋落量,降水减少会促进各组分凋落物量。

       

      Abstract: In order to understand the composition and seasonal dynamics of forest litter under the condition of long-term nitrogen deposition and precipitation decreasing at community level in broadleaved Korean pine forest in Changbai Mountains of northeastern China, we collected the litterfall in three different control experiment platform: N addition(NA), reduced precipitation and N addition(RN)and control(CK)with direct collection method at the runoff experimental field in 2015 growing season(June to October). We separated the litter into twig(TW), Pinus koraiensis(PK), Quercus mongolica(QM), other broadleaves(OT) and the reproductive organics and bark(ROB). This paper takes litterfall coefficient as the measure of capacity of forest litter production in comparing the "net" differences among litter groups.The results showed that leaf litter had the largest proportion, quantified 79%-81% of the total, and the Tw and ROB proportion was relatively small, but they can also accounted for 19%-21%;The litter dynamic rhythm was unimodal type and the peak of litterfall concentrated in September and October, and declining precipitation can take the litterfall period of others in advance; Different litterfall components had varied responses to the nitrogen addition and rainfall reduction, nitrogen addition significantly reduced the amount of PK leaf litter, and rainfall reduction significantly increased the amount of other broadleaves and total leaf litter, but QM, TW and ROB litter had no significant response to nitrogen and rainfall controlling; nitrogen addition can restrain the litter of conifer and promote the litter of broadleaved tree species, rainfall will promote the litter amount of all components.

       

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