【摘要】 在次生白桦林内不同光强(高光照HL,64%全光、中等光照ML,45%全光、低光照LL,15%全光)条件下栽植2 a生水曲柳、胡桃楸苗木,采用不同施肥(CK、N、P、N+P)处理,1个生长季后测定苗木生长、生物量、比叶面积。结果表明:光照条件对水曲柳的苗高影响明显,苗高生长量顺序为HL>ML>LL,其中HL处理较LL处理提高69.8%(P<0.01);光照条件对水曲柳地径生长影响不明显。施肥对水曲柳苗高、地径生长影响明显,各施肥处理苗高、地径生长量排序均为NP>N>P>CK,NP和N处理比CK处理苗高生长量分别提高82.3%和56.1%(P<0.01),地径生长量分别提高27.4%和25.4%(P<0.05)。光照条件对胡桃楸的苗高影响明显,苗高生长量顺序为HL>ML>LL,其中HL处理较LL处理提高57.0%(P<0.05);施肥对胡桃楸的苗高影响明显,苗高生长量顺序为NP>P>N>CK,其中NP和P处理比CK处理分别提高40.0%和39.5%(P<0.05)。光照和施肥对胡桃楸地径影响不明显。光照条件对水曲柳、胡桃楸单株生物量影响明显,其顺序均为HL>ML>LL,其中HL处理较LL处理分别提高128.5%和83.3%(P<0.05);施肥对水曲柳和胡桃楸单株生物量影响明显,其顺序分别为NP>N>P>CK和NP>P>N>CK,其中NP处理比CK处理分别提高27.7%和112.3%(P<0.05)。光照条件对2树种冠根比和比叶面积影响明显,且HL处理显著低于LL处理(P<0.05)。施肥对2树种的冠根比和比叶面积影响明显,且施肥增大冠根比,减小了比叶面积。综上所述,林冠下水曲柳和胡桃楸苗木在HL处理和同施氮磷时,生长最好。更多还原

【Abstract】 Under the second growth stand of Betula platyphylla and condition of different light intensity( high light( HL,64% full light),medium light( ML,45% full light),low light( LL,15% full light)),two-year old Fraxinus mandshurica and Juglans Mandshurica seedlings were planted,using different fertilization( CK,N,P,N + P) treatments. At the end of the growing season,the seedling growth,biomass,and specific leaf area were measured. The results showed that: light had significantly effect on the height growth of F. mandshurica,being HL > ML > LL,and it under HL treatment were 69. 8% higher than that with LL treatment( P< 0. 01). Effect of light on diameter growth of F. mandshurica was not obvious. Fertilization had significant effect on the height and growth diameter of F. mandshurica,being N + P > N > P > CK. Respectively,the height growth of F. mandshurica under NP and N treatments was 82. 3% and 56. 1% higher than that with CK treatments( P < 0. 01),and the diameter growth of F. mandshurica under NP and N treatments was 27. 4% and 25. 4% greater than that with CK treatments( P < 0. 05). Light had significant effect on the height growth of J. mandshurica,being HL > ML > LL,and it under HL treatment was 57. 0% higher than that with LL treatment( P< 0. 05). Fertilization had significant effect on the height of J. mandshurica,being N + P > P > N > CK,and it under NP and P treatments was 40. 0% and 39. 5% higher than that with CK treatments( P < 0. 05); Effects of light and fertilization on diameter growth of J. mandshurica were not obvious. Light had significant effect on the biomass of F. mandshurica and J. mandshurica,both being HL > ML > LL,respectively,and it under HL treatment was 128. 5% and 83. 3%( P ﹤ 0. 05) higher than that with LL treatment( P <0. 05). Fertilization had significant effect on the biomass of F. mandshurica and J. mandshurica,respectively,being N + P > N > P> CK and N + P > P > N > CK,it under NP treatments was 27. 7% and112. 3 % higher than that with CK treatments( P < 0. 05).Light had significant effect on the shoot / rootratio( S / R) and specific leaf area of 2 tree species,and HL treatment was significantly lower than LL treatment( P < 0. 05). Fertilization had significant effect on the shoot / rootratio( S / R) and specific leaf area of 2 tree species,shoot / rootratio( S / R) increasing and specific leaf area reducing. In conclusion,HL( 64%) and N + P treatments were most conducive to seedlings growth.更多还原