文章摘要
李鹏, 陈璇, 杨章旗, 颜培栋, 陈虎, 零天旺, 陆绍浩.不同密度马尾松人工林枯落物输入对土壤理化性质的影响[J].水土保持学报,2022,36(2):368~377
不同密度马尾松人工林枯落物输入对土壤理化性质的影响
Effects of Litter Input on Soil Physical and Chemical Properties of Pinus massoniana Plantations with Different Densities
投稿时间:2021-09-01  
DOI:10.13870/j.cnki.stbcxb.2022.02.047
中文关键词: 马尾松  枯落物  土壤理化性质  结构方程
英文关键词: Pinus massoniana  litter  soil physical and chemical properties  structural equation
基金项目:国家“十三五”重点研发计划项目(2017YFD060030202,2017YFD0601201);广西院士后备人才培育项目(桂科AD19254004);八桂学者和八桂青年学者专项;广西创新驱动专项(桂AA17204087-1,桂AA17204087-4)
作者单位E-mail
李鹏1, 陈璇2, 杨章旗1, 颜培栋1, 陈虎1, 零天旺3, 陆绍浩3 1. 广西壮族自治区林业科学研究院国家林草局马尾松工程技术研究中心, 广西马尾松工程技术研究中心, 广西优良用材林资源培育重点实验室, 南宁 530002

2. 贵州省林业调查规划院
, 贵阳 550003

3. 广西横州市镇龙林场
, 广西 横州 530327 
Yangzhangqi@163.com 
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中文摘要:
      为研究不同密度马尾松人工林枯落物输入对土壤理化性质和林分生长影响,选择适宜的人工林经营措施提供参考。以2 500,3 300,4 500,6 000株/hm2(分别记为M1、M2、M3和M4)4种造林密度的马尾松人工林为研究对象,利用结构方程探究不同密度马尾松林枯落物输入对土壤性质的影响。结果表明:林分密度对枯落物和土壤理化性质均具有显著影响,其中枯落物总蓄积量和持水量表现为M2密度最大,显著高于其他密度;同时M2密度中枯落物碳、氮、磷、钾养分储量最大,以有机碳为主,占总储量的96.98%。随土层深度的增加,土壤理化性质差异性减少,枯落物层对土壤表层理化性质影响较大,土壤持水性、孔隙度、pH、全磷、碱解氮和速效磷均在M2中最大,有机质和全氮呈现M4>M2>M3>M1,渗透性、全钾和速效钾在M1中最大。枯落物蓄积量和养分储量与土壤粉粒、持水性、孔隙度、有机质、全磷和碱解氮呈显著正相关。结构方程显示,枯落物总蓄积量对土壤理化性质均具有显著正相关,而持水性对土壤化学性质具有显著负相关;土壤化学性质对林分蓄积量具有显著正相关,而枯落物养分储量对林分蓄积量具有显著负相关。综上,M2密度下马尾松林枯落物总蓄积量和养分储量较多,能够起到减少地表径流,增加土壤持水性和孔隙度,并减少速效养分流失,促进根系伸展和延伸,是比较科学的马尾松营林措施。
英文摘要:
      The purpose of this study was to study the influence of Pinus massoniana litter input with different densities on the soil physical and chemical properties and stand growth, and to improve the theoretical basis for selecting appropriate plantation management measures. Four planting densities, 2 500 trees/hm2 (M1), 3 300 trees/hm2 (M2), 4 500 trees/hm2 (M3) and 6 000 trees/hm2 (M4) of P. massoniana forests, were set up as research subject. The structure equation was used to explore the influence of litter input of P. massoniana forest with different densitieson soil properties. The result showed that forest density had a significant impact on litter and soil physical and chemical properties. The total storage and water holding capacity of litter were the highest under M2, which was significantly higher than others. The litter had the largest nutrient reserves of carbon, nitrogen, phosphorus, and potassium in M2, amongh which the orgainic carbon is the major, accounting for 96.98% of the total. The differences in soil physical and chemical properties decreased with the depth of the soil layer increased, and the litter layer had a greater impact on the physical and chemical properties in the surface soil. Soil water holding capacity, porosity, pH, total phosphorus, alkaline nitrogen and available phosphorus were all the highest in M2, whereas the organic matter and total nitrogen presented as M4>M2>M3>M1, and total potassium and available potassium had highest contents in M1. Litter accumulation and nutrient reserves were significantly positively correlated with soil silt, water holding capacity, porosity, organic matter, total phosphorus, and available nitrogen, while significantly negatively correlated with soil bulk density and permeability. The structural equation showed that the total storage of litter had a significantly positive correlation with soil physical and chemical properties, whereas soil water holding capacity had a significantly negative correlation with soil physical and chemical properties. Soil chemical properties had a significant positive correlation with forest volume, and a significant negative correlation was found between the forest stock and litter nutrients contents. In summary, the P. massoniana forest with M2 density had the more litter accumulation and nutrients reserves, which could reduce surface runoff, increase soil water holding capacity and porosity, reduce the loss of available nutrients, and promote root extension and extension, which should be the more appropriate forestation measures.
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