林业资源管理
林業資源管理
임업자원관리
FORESTRY RESOURCE MANAGEMENT
2014年
4期
85-91
,共7页
公宁宁%王小平%李皓%马履一%贾忠奎%段稢%林平
公寧寧%王小平%李皓%馬履一%賈忠奎%段稢%林平
공저저%왕소평%리호%마리일%가충규%단욱%림평
油松人工林%林分密度%树冠生长%植物多样性
油鬆人工林%林分密度%樹冠生長%植物多樣性
유송인공림%림분밀도%수관생장%식물다양성
Pinus tabulaeformis plantation%stand density%tree crown growth%plant diversity
以20块6种不同密度梯度的北京地区低山阴坡厚土40a左右油松人工林为研究对象，分析其林分生长、树冠生长、林下植物多样性以及林下生物量对林分密度的响应关系，研究结果表明：胸径、树高、冠幅随林分密度的增大而减小，当林分密度增大到1500株/hm2时，减小的趋势趋于稳定；枝长平均生长量、连年生长量均随年龄的增大有先增加后下降的趋势，林分密度＞1500株/hm2时，枝生长量下降趋势明显；枝材积生长量在各年龄阶段的变化也随林分密度的增大表现出抑制响应，与枝长生长量的变化规律类似；林下灌木、草本物种均匀度指数Jsw，Simpson多样性指数和Shannon-Wiener多样性指数均随林分密度的增大而减小；随林分密度的减小，草本层生物量逐渐增加，灌木层生物量先增加后略减，林分密度为1000～1200株/hm2时灌木生物量最大，为3802.94kg/hm2。对于北京低山阴坡厚土40a左右的油松人工林来说，经营密度宜为1000～1500株/hm2。
以20塊6種不同密度梯度的北京地區低山陰坡厚土40a左右油鬆人工林為研究對象，分析其林分生長、樹冠生長、林下植物多樣性以及林下生物量對林分密度的響應關繫，研究結果錶明：胸徑、樹高、冠幅隨林分密度的增大而減小，噹林分密度增大到1500株/hm2時，減小的趨勢趨于穩定；枝長平均生長量、連年生長量均隨年齡的增大有先增加後下降的趨勢，林分密度＞1500株/hm2時，枝生長量下降趨勢明顯；枝材積生長量在各年齡階段的變化也隨林分密度的增大錶現齣抑製響應，與枝長生長量的變化規律類似；林下灌木、草本物種均勻度指數Jsw，Simpson多樣性指數和Shannon-Wiener多樣性指數均隨林分密度的增大而減小；隨林分密度的減小，草本層生物量逐漸增加，灌木層生物量先增加後略減，林分密度為1000～1200株/hm2時灌木生物量最大，為3802.94kg/hm2。對于北京低山陰坡厚土40a左右的油鬆人工林來說，經營密度宜為1000～1500株/hm2。
이20괴6충불동밀도제도적북경지구저산음파후토40a좌우유송인공림위연구대상，분석기림분생장、수관생장、림하식물다양성이급림하생물량대림분밀도적향응관계，연구결과표명：흉경、수고、관폭수림분밀도적증대이감소，당림분밀도증대도1500주/hm2시，감소적추세추우은정；지장평균생장량、련년생장량균수년령적증대유선증가후하강적추세，림분밀도＞1500주/hm2시，지생장량하강추세명현；지재적생장량재각년령계단적변화야수림분밀도적증대표현출억제향응，여지장생장량적변화규률유사；림하관목、초본물충균균도지수Jsw，Simpson다양성지수화Shannon-Wiener다양성지수균수림분밀도적증대이감소；수림분밀도적감소，초본층생물량축점증가，관목층생물량선증가후략감，림분밀도위1000～1200주/hm2시관목생물량최대，위3802.94kg/hm2。대우북경저산음파후토40a좌우적유송인공림래설，경영밀도의위1000～1500주/hm2。
This paper studied the changes in stand growth,understory plant diversity,forest biomass and crown growth of Pinus tabulaeformis plantation (40 years old or so)under the different conditions of stand density at low hill shade slope.Results showed that:DBH,tree height,crown width decreased with stand density increase,when stand density increases to 1500 individuals per hectare,the reduced tendency was to stabilize.The average amount of branch length growth,year after year volume growth increased with age increase and then decreased afterwards.With stand density>1500 individuals per hectare,the average a-mount of branch length growth decreased significantly.Branch volume increment also increases with stand density that shows inhibition of response,and the amount of branch length variation of a similar growth.As stand density increases,the understory shrubs,herbaceous species evenness index Jsw,Simpson diversity index and Shannon-Wiener diversity index decreased.With stand density decreases,the herb layer bio-mass increased gradually,shrub layer biomass increased and slightly reduced.The biomass of shrubs was maximum when stand density was 1000 -1200 individuals per hectare.For Beijing low hill shade slope Pinus tabulaeformis plantation (40 years old or so),the management density is between 1000-1500 indi-viduals per hectare.
