红松阔叶混交林中坑和丘的微立地特征及其对植被更新的影响

应用生态学报

红松阔叶混交林中坑和丘的微立地特征及其对植被更新的影响

杜珊¹,段文标^1**,王丽霞¹,陈立新¹,魏全帅¹,李猛²,王利冬³

(¹东北林业大学林学院, 哈尔滨 150040; ²中国科学院东北地理与农业生态研究所黑土区农业生态院重点实验室/海伦农田生态系统国家野外观测研究站, 哈尔滨 150081; ³凉水国家自然保护区, 黑龙江伊春 153106)

出版日期:2013-03-18 发布日期:2013-03-18

Microsite characteristics of pit and mound and their effects on the vegetation regeneration in Pinus koraiensisdominated broadleaved mixed forest.

DU Shan¹, DUAN Wen-biao¹, WANG Li-xia¹, CHEN Li-xin¹, WEI Quan-shuai¹, LI Meng², WANG Li-dong³

(¹College of Forestry, Northeast Forestry University, Harbin 150040, China; ^2Key Laboratory of Mollisols Agroecology/National Observation Station of Hailun Agroecology System, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin 150081, China; ^3Liangshui National Nature Reserve, Yichun 153106, Heilongjiang, China)

Online:2013-03-18 Published:2013-03-18

摘要/Abstract

摘要：

2011年8月，在红松阔叶混交林2.55 hm²的样地内,调查了42株倒木及其形成的坑和丘复合体的微立地特征及其植被更新状况，测定了丘顶、丘面、坑壁、坑底、完整立地5个微立地的土壤含水量、土壤温度、空气相对湿度和光合有效辐射.结果表明: 在5个微立地中,丘顶的光合有效辐射最高(527.9 μmol·m^-2·s^-1),完整立地最低(58.7 μmol·m^-2·s^-1);丘顶的土壤温度最高(16.0 ℃),坑底最低(13.3 ℃);坑底的土壤含水量最高(34.6%),丘面最低(0.5%);完整立地的空气相对湿度最高(75.9%),丘顶最低(68.0%).形成坑和丘复合体的5个树种的频率大小依次是红松(42.9%)＞云杉(31.0%)＞白桦(16.7%)＞冷杉(7.1%)＞稠李(2.4%).42株掘根倒木中,有2/3偏向西北方向.倒木体积与坑深度、坑长度、丘高度、丘宽度均呈极显著正相关,与丘厚度呈负相关.坑的宽度和长度分别与倒木的胸径呈显著和极显著正相关.不同微立地之间物种丰富度的大小顺序为完整立地＞坑＞丘;所有树种盖度的大小顺序依次为完整立地＞坑＞丘.

Abstract: An investigation was conducted in a 2.55 hm² plot of Pinus koraiensisdominated broadleaved mixed forest to study the microsite characteristics of pit and mound formed by 42 treefalls and the status of vegetation regeneration on the microsites. The soil water content, soil temperature, relative air humidity, and photosynthetically active radiation (PAR) on five microsites (mound top, mound face, pit wall, pit bottom, and intact forest floor) were measured. Among the five mirosites, mound top had the highest PAR (527.9 μmol·m^-2·s^-1) while intact forest floor had the lowest one (58.7 μmol·m^-2·s^-1), mound top had the highest soil temperature (16.0 ℃) but pit bottom had the lowest one (13.3 ℃), pit bottom had the highest soil water content (34.6%) but mound face had the lowest one (0.5%), and intact forest floor had the highest relative air humidity (75.9%) but mound top had the lowest one (68.0%). The frequency of forming pit/mound complex by the tree species was decreased in the order of Pinus koraiensis (42.9%)>Picea asperata (31.0%) > Betula platyphylla (16.7%) > Abies fabri (7.1%) > Prunus padus (2.4%). Among the 42 treefalls, twothirds of them were in northwest direction. The treefalls volume had significant positive correlations with pit depth, pit length, mound height, and mound width, but negative correlation with mound thickness. The treefall mean diameter at breast height had significant positive correlations with pit width (r=0.328, P=0.017) and pit length (r=0.527, P=0). The tree species richness at the microsites decreased in the order of intact forest floor > pit > mound, and the tree species coverage was in the sequence of intact forest floor > pit > mound.

杜珊1,段文标1**,王丽霞1,陈立新1,魏全帅1,李猛2,王利冬3. 红松阔叶混交林中坑和丘的微立地特征及其对植被更新的影响[J]. 应用生态学报.

DU Shan1, DUAN Wen-biao1, WANG Li-xia1, CHEN Li-xin1, WEI Quan-shuai1, LI Meng2, WANG Li-dong3. Microsite characteristics of pit and mound and their effects on the vegetation regeneration in Pinus koraiensisdominated broadleaved mixed forest.[J]. Chinese Journal of Applied Ecology.