Effects of Different Structure of Platycladusorientalis Plantation in Beijing Jiulongshan on Redistribution of Precipitation
Objective]Based on the precipitation data of 2014 toanalyze quantitatively the law of redistribution of precipitationin mountainous area of North China.[Method]The method of field positioning was used to analyze the rainfall redistribution of Platycladusorientalis plantation with different structure (canopy,under branch height)char-acteristics.[Result](1 )At the height of 1/2 under branch height,the through rainfalls of stands with canopy den-sity of 0.4,0.6,0.8 respectively were 181.1,168.1,and 147.1 mm,the rates of through rainfall were 78.8%, 73.1%,and 64.0%;The total stemflowswere 6.0,5.9 and 3.9 mm respectively,the rates of stemflowwere 4.2%,2.6% and 1.7%.The total canopy interceptionswere respectively 39.5,56.1 and 79.1 mm.The rates of canopy interception were 17.1%,24.4%and 34.4%.(2)At the height of 1/3 under branch height,the through rainfall of stands with canopy density of 0.4,0.6,0.8 canopy were 175.6 mm,154.8 mm,and 136.0 mm,the rates of through rainfall were 76.4%,67.3%,and 59.2%.The total stemflowswere respectively 8.3,4.9 and 3.3 mm,the rates of stemflowwere 3.6%,2.1% and 1.4%.The total canopy interceptionswere respectively 46.2, 70.4 and 90.6 mm.The rates of canopy interception were 20.1%,30.6%and 39.4%.[Conclusion](1)At the same under branch height,the difference in through rainfall of P.orientalisplantation with different canopy coverage was not significant.The stemflow between the stands with canopy density of 0.4 and 0.8 showed significant differ-ence,while the difference between the canopy density of 0.4 and 0.6 and between the canopy density of 0.6 and 0.8 were not significant.(2)At the stand with the density of 0.4,0.6,and 0.8,the canopy interception of the stand with crown thickness accounts for 2/3 the tree height were 1.17,1.25 and 1.14 times that of the stand with crown thickness accounts for 1/2 the tree height.(3 )Significant differences in crown interception were found a-mong different canopy density.(4)At the same rainfall intensity,the more the rainfall,the smaller the canopy in-terception;the longer the interval of rainfall time,the drier the canopy drier and the stronger the interception abili-ty;The lower the branch height,the larger the canopy interception amount and with the increase of the canopy den-sity,the canopy interception increased.
NETL
NSTL
万方数据
维普
