林业科学 ›› 2021, Vol. 57 ›› Issue (3): 18-28.doi: 10.11707/j.1001-7488.20210303
佘萍1,2,曹兵2,王彦辉3,*,余治家1,王正安1,马杰1,贾宝光1
收稿日期:
2020-03-15
出版日期:
2021-03-25
发布日期:
2021-04-07
通讯作者:
王彦辉
基金资助:
Ping She1,2,Bing Cao2,Yanhui Wang3,*,Zhijia Yu1,Zheng Wang1,Jie Ma1,Baoguang Jia1
Received:
2020-03-15
Online:
2021-03-25
Published:
2021-04-07
Contact:
Yanhui Wang
摘要:
目的: 研究华北落叶松人工林天然更新的主要限制因素,探索寻找促进天然更新的实用技术,为改善华北落叶松林天然更新和林分结构提供技术支撑。方法: 在宁夏六盘山选择5个试验点,每个试验点按林冠郁闭度不同选择华北落叶松人工林5类生境(近熟林的林冠下、林隙、林中空地、林缘和退耕幼龄林地),每类生境各设1块12 m×20 m样地,2018年10月中旬在每块样地设置割草、除落、开沟、挖穴和对照5种处理,采用完全随机区组设计,每个区组平行于等高线排列,地表处理后撒播华北落叶松种子(100粒·m-2)。整个试验共设置25块样地,每块样地5种处理,每种处理3次重复。在近熟林林冠下和退耕幼龄林生境设置防止鸟鼠采食种子的尼龙网覆盖和不覆盖2种措施。2019年6月计数存活幼苗,并进行统计分析。结果: 不覆网时,退耕幼龄林、林缘、林隙、林冠下和林中空地5类生境的幼苗密度均值依次为2.7、1.8、1.4、1.3和0.8株·m-2;开沟、挖穴、清枯、割草和对照5种处理幼苗密度均值依次为2.1、1.9、1.8、1.3和1.1株·m-2;每类生境的5种处理之间,最高的平均幼苗密度依次为林缘样地开沟4.1株·m-2、退耕幼龄林样地割草3.6株·m-2、林隙样地开沟2.4株·m-2、林冠下样地挖穴2.1株·m-2、林中空地挖穴1.3株·m-2。林地覆网能极显著提高所有处理的幼苗密度。近熟林内林冠下样地的幼苗密度均值提高幅度依次为清除枯落物2.3株·m-2、开沟1.0株·m-2、对照0.5株·m-2、挖穴0.5株·m-2、割草0.5株·m-2,即可提高0.5~2.3株·m-2;退耕幼林样地的幼苗密度均值提高幅度依次为清枯2.3株·m-2、开沟1.7株·m-2、挖穴1.3株·m-2、割草0.6株·m-2、对照0.3株·m-2,即可提高0.3~2.3株·m-2,与近熟林内林冠下样地基本一致。结论: 限制华北落叶松人工林天然更新的主要因素包括动物采食种子、过厚枯落物层阻碍幼苗根系进入土壤、病虫危害、杂草竞争和过密林冠遮荫等;建议采取的最佳复合措施为:通过间伐形成或选择业已存在的中等郁闭生境(如未郁闭幼龄林、林缘、林隙等),在林地部分区域全部清除枯落物或大面积开沟,下种后覆盖防止动物取食种子的尼龙网,这样可大幅提高林下幼苗密度。
中图分类号:
佘萍,曹兵,王彦辉,余治家,王正安,马杰,贾宝光. 华北落叶松人工林地表处理措施对当年幼苗密度的影响[J]. 林业科学, 2021, 57(3): 18-28.
Ping She,Bing Cao,Yanhui Wang,Zhijia Yu,Zheng Wang,Jie Ma,Baoguang Jia. Effect of Forest Floor Treatments on Density of the First-Year Seedlings in Larix principis-rupprechtii Plantation[J]. Scientia Silvae Sinicae, 2021, 57(3): 18-28.
表1
样地概况"
试验点 Study site | 生境类型 Habitat type | 坐标 Geographical coordinates | 海拔 Altitude/m | 坡向 Slope aspect | 坡度 Slope gradient/(°) | 坡位 Slope position | 草本高度 Grass height/cm | 草本盖度 Grass coverage(%) |
东部 East | 林冠下Under canopy | 106.350 16°E, 35.779 27°N | 2 051 | 东北Northeast | 5 | 中Middle | 10 | 45 |
林隙Forest gaps | 106.349 97°E, 35.779 74°N | 2 039 | 东北Northeast | 7 | 中Middle | 50 | 100 | |
林中空地Forest glades | 106.350 74°E, 35.780 79°N | 2 015 | 平地Flat | 1 | 下Down | 80 | 100 | |
林缘Forest edges | 106.349 74°E, 35.780 00°N | 2 036 | 东北Northeast | 12 | 中Middle | 12 | 75 | |
退耕幼龄林Young forests | 106.352 07°E, 35.783 95°N | 1 990 | 平地Flat | 1 | 下Down | 75 | 100 | |
南部 South | 林冠下Under canopy | 106.385 98°E, 35.299 58°N | 2 163 | 北North | 10 | 中Middle | 10 | 60 |
林隙Forest gaps | 106.393 32°E, 35.302 78°N | 2 064 | 南South | 7 | 下Down | 40 | 100 | |
林中空地Forest glades | 106.393 31°E, 35.302 74°N | 2 064 | 南South | 6 | 下Down | 40 | 100 | |
林缘Forest edges | 106.393 30°E, 35.302 76°N | 2 064 | 南South | 7 | 下Down | 35 | 100 | |
退耕幼龄林Young forests | 106.401 32°E, 35.303 35°N | 2 016 | 平地Flat | 1 | 下Down | 27 | 100 | |
中部 Center | 林冠下Under canopy | 106.259 02°E, 35.551 88°N | 2 253 | 东南Southeast | 7 | 下Down | 8 | 45 |
林隙Forest gaps | 106.259 02°E, 35.551 88°N | 2 253 | 东南Southeast | 9 | 下Down | 15 | 100 | |
林中空地Forest glades | 106.258 61°E, 35.552 33°N | 2 256 | 东南Southeast | 3 | 下Down | 15 | 100 | |
林缘Forest edges | 106.259 50°E, 35.554 07°N | 2 229 | 东北Northeast | 18 | 下Down | 35 | 45 | |
退耕幼龄林Young forests | 106.252 36°E, 35.574 45°N | 1 963 | 北North | 15 | 下Down | 18 | 95 | |
北部 North | 林冠下Under canopy | 106.206 82°E, 35.769 09°N | 2 310 | 北North | 32 | 中Middle | 45 | 100 |
林隙Forest gaps | 106.206 94°E, 35.769 87°N | 2 307 | 北North | 17 | 中Middle | 40 | 90 | |
林中空地Forest glades | 106.199 04°E, 35.781 01°N | 2 276 | 北North | 15 | 中Middle | 20 | 70 | |
林缘Forest edges | 106.208 38°E, 35.771 05°N | 2 239 | 北North | 6 | 下Down | 125 | 100 | |
退耕幼龄林Young forests | 106.208 73°E, 35.769 94°N | 2 234 | 北North | 1 | 下Down | 20 | 85 | |
西部 West | 林冠下Under canopy | 106.186 94°E, 35.583 77°N | 2 335 | 西北Northwest | 12 | 下Down | 30 | 85 |
林隙Forest gap | 106.186 77°E, 35.583 81°N | 2 323 | 西北Northwest | 14 | 下Down | 32 | 100 | |
林中空地Forest glade | 106.185 05°E, 35.583 52°N | 2 299 | 西北Northwest | 12 | 下Down | 10 | 90 | |
林缘Forest edge | 106.186 31°E, 35.583 33 °N | 2 331 | 西北Northwest | 8 | 下Down | 18 | 100 | |
退耕幼林Young forest | 106.172 40°E, 35.575 44°N | 2 314 | 北North | 2 | 上Upper | 45 | 100 |
表2
近熟林林冠下有无覆网时5种处理的幼苗密度差异①"
处理 Treatment | 覆网 Mesh-covering | 不覆网 No mesh-covering | 覆网导致的差别 Difference caused by mesh-covering |
清枯Removing humus layer | 3.7±1.2 aA | 1.4±0.3 aB | 2.3±0.9 |
开沟Opening ditches | 2.7±1.1 abA | 1.7±0.4 aB | 1.0±0.7 |
对照Control | 1.6±0.7 abA | 1.1±0.5 abB | 0.5±0.2 |
挖穴Digging holes | 1.5±0.4 abA | 1.0±0.2 abB | 0.5±0.2 |
割草Grass cutting | 0.6±0.3 bA | 0.1±0.1 bB | 0.5±0.2 |
均值Mean | 2.0±0.4 | 1.1±0.2 | 0.9±0.2 |
表3
退耕幼龄林下有无覆网时5种处理的幼苗密度差异"
处理 Treatment | 覆网 Mesh-covering | 不覆网 No mesh-covering | 覆网导致的差别 Difference caused by mesh-covering |
开沟Opening ditches | 4.8±1.4 aA | 3.1±0.4 aB | 1.7±1.0 |
清枯Removing humus layer | 4.8±1.3 aA | 2.5±0.6 aB | 2.3±0.7 |
挖穴Digging holes | 4.0±1.2 aA | 2.7±0.4 aB | 1.3±0.8 |
割草Grass cutting | 2.7±1.1 aA | 2.1±0.4 aB | 0.6±0.7 |
对照Control | 2.0±1.0 aA | 1.7±0.7 aB | 0.3±0.3 |
均值Mean | 3.7±0.5 | 2.4±0.2 | 1.3±0.3 |
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