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时间:2020-06-20
《我国华北地区落叶松林碳储量动态研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、山东林业科技2014年第4期总213期SHANDONGFORESTRYSCIENCEANDTECHNOLOGY2014.No.4文章编号:1002—2724(2014)04—0036~05我国华北地区落叶松林碳储量动态研究李少娟,张德全(1.山东省聊城市国有林场管理站,山东聊城252000;2.山东省林业监测规划院)摘要:通过对解析木及一类林业调查样地材料碳储量及碳密度的研究,求出树木碳增量的年降水、材积及时间阀值,得出落叶松碳密度增长的材积限制条件年生长量现实林为2.84m。/hm,近自然林6.837m。/hm,理想林8.052m。/hm。,均不能高于这一阀值;时
2、间限制条件为近自然林为区间(3.58a,19.95a),理想林为(6.4a,2O.33a);降水量限制条件为年降水量区间现实林为(586.18ram,756.86ram),近自然林(435.55ram,1508.1ram),年降水量高于690.3ram,出现负相关,理想林(0,958.87mm),年降水量高于690.5mm,出现负相关,因此年降雨量超过690.3mm,不宜进行浇水作业,即使进行浇水,也不要高于这一当量。平均递增速度最快的年份近自然林为16.14a;即时递增速度最快的年份为8.07a。过多的人为干扰使树木适应的生态住宽度(包括时间生态位、降雨量生态位、
3、材积生长量等)明显变得狭窄,引起蓄积量及碳密度拓展空间明显变小,因此发展近自然林业势在必行。关键词:阀值;限值;经验方程;解析木;年降雨量;落叶松;碳储量中图分类号:Xl71.1文献标识码:AForestOrganicCarbonStorageandItsTrendofLarchinNorthChinaLIShaojuan,ZHANGDequan(1.State—ownedForestFarmManagementStationofShandongProvince,Liaocheng,China,252000;2.ForestrySurveyandPlanningIn
4、stituteofShandongProvince)Abstract:AccordingtothedataofCarbonStorageandCdensityofparsewoodandcontinuousforestinventory,discussedempiricalequation。suchasthis,madevariableofForestOrganicCarbonStorage,madeindependentvariableofyearlyprecipitation,timeandforestcreatedthefunction.Throughcomp
5、utationalmathematicsasaderivationofthefunctionoperation,foundthetreegrowthinannualrainfall,time,anditsvolumeoftimber。ofthresholdvalues,limitingvalues,extremevalues.Drewtheextremevalueswithempiricalequationy(p)一e.Drewthelimitingvalueswithempiricalequationy—a—b/x,y—a+bx,y—a+blnx.Drewthet
6、hresholdvalueswithempiricalequationy一1/(a+blnx),Y一1/(a+bx).ThelimitingvaluesofvolumegrowthwiththegrowthofCdensitywas2.84m。/hmofrealforest,6.837m/hmofnearnatureforestand8.052m/hmofperfectforest.InordertoincreaseofCdensityprogressively,thelimitingvaluesoftimewasintheinterval(3.58a,19.95a
7、)ofnearnatureforestand(6.4a,20.33a)ofperfectforest,theageofaveragewas16.14aandtherealtimewas8.07aofnearnatureforest.InordertogrowthofCdensity.Thelimitingvaluesofannualrainfallwasintheinterval(586.18ram,756.86mm)ofrealforest,(435.55mm,1508.1mm)ofnearnatureforest,and(0,958.87ram)ofperf
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