林业科学 ›› 2021, Vol. 57 ›› Issue (7): 32-42.doi: 10.11707/j.1001-7488.20210704
曹宇1,3,4,巢林2,安宇宁1,4,吴德东1,3,4,张学利1,3,4,李红1,4,刘艳艳2,*
收稿日期:
2020-02-22
出版日期:
2021-07-25
发布日期:
2021-09-02
通讯作者:
刘艳艳
基金资助:
Yu Cao1,3,4,Lin Chao2,Yuning An1,4,Dedong Wu1,3,4,Xueli Zhang1,3,4,Hong Li1,4,Yanyan Liu2,*
Received:
2020-02-22
Online:
2021-07-25
Published:
2021-09-02
Contact:
Yanyan Liu
摘要:
目的: 比较科尔沁沙地典型生境上生长的刺榆木质部水力结构特征、叶片水分关系与光合气体交换特征,探讨刺榆适应不同土壤水分环境的内在生理机制,为科尔沁沙地防风固沙造林和植被修复的适地适树提供理论依据。方法: 以生长在科尔沁沙地丘间低地和沙丘上部2种土壤水分环境中的刺榆为研究对象,从树木水力结构角度,分析不同生境刺榆枝条水分传输效率与安全性的差异,结合叶片水分关系、光合生理特性以及木质部解剖结构等进行对比研究。结果: 与沙丘上部相比,丘间低地土壤水分条件较好,刺榆枝条木质部导管直径较大、水分传输效率(Ks)更高(P<0.05),叶片和枝条水势均更高(P<0.05)。尽管2种生境上生长的刺榆叶片光合碳同化速率无明显差异,但气孔导度(gs)和水分利用效率(WUEi)明显不同,沙丘上部刺榆的gs更低(P<0.05),WUEi更高(P<0.05)。丘间低地刺榆枝条末端叶面积和边材面积的比值(LA/SA)显著高于沙丘上部(P<0.05),地径、树高和地上生物量等指标也显著高于沙丘上部(P<0.05);但沙丘上部刺榆木材密度更高,抗气穴化栓塞能力更强,水力安全边界(HSM)也较宽(ΨS-md-P50和ΨS-md-P80较大)。结论: 在土壤水分条件较好的丘间低地生长的刺榆,导管直径较大,水分传输效率更高,可保证较高的生长速率和竞争力;而在土壤水分条件较差的沙丘上部生长的刺榆,木质部导管直径变小,虽然水分传输效率降低,但有助于获得更强的木质部抗气穴化栓塞能力,从而保证植株能在水分胁迫较严重的生境中长期存活。刺榆水力结构特征随水分生境变化而调整的策略,反映出其较强的抗旱性和适应性。
中图分类号:
曹宇,巢林,安宇宁,吴德东,张学利,李红,刘艳艳. 科尔沁沙地刺榆水力结构特征对土壤水分环境的响应[J]. 林业科学, 2021, 57(7): 32-42.
Yu Cao,Lin Chao,Yuning An,Dedong Wu,Xueli Zhang,Hong Li,Yanyan Liu. Response of Hydraulic Architecture of Hemiptelea davidii to Soil Water Conditions in Horqin Sandy Land[J]. Scientia Silvae Sinicae, 2021, 57(7): 32-42.
表1
2种生境的刺榆生长特征①"
生境 Habitat | 地径 Basal diameter/cm | 树高 Tree height/m | 单株地上生物量Individual aboveground biomass/kg | |||
叶Leaf | 枝Branch | 干Stem | 合计Total | |||
丘间低地 Interdune | 4.28 ± 0.25a | 2.95 ± 0.11a | 0.23 ±0.02a | 0.33 ± 0.02a | 0.61 ± 0.03a | 1.17 ± 0.04a |
沙丘上部 Upperdune | 2.59 ± 0.11b | 1.62 ± 0.06b | 0.12 ± 0.02b | 0.12 ± 0.01b | 0.24 ± 0.03b | 0.48 ± 0.06b |
表2
2种生境的刺榆枝条和叶片水力特征①"
生境 Habitat | LA*/m2 | LMA**/(g·cm-2) | LS**/cm2 | ΨL-pd**/MPa | ΨL-md**/ MPa | ΨS-md**/MPa | SA/ cm2 | WD**/(g·cm-3) | P50**/MPa | P80*/MPa | HSM*/MPa | |
ΨS-md- P50 | ΨS-md- P80 | |||||||||||
丘间低地 Interdune | 0.19 ± 0.02 | 93.69 ± 2.50 | 6.32 ± 0.37 | -0.56 ± 0.03 | -1.68 ± 0.05 | -0.72 ± 0.03 | 0.26 ± 0.24 | 0.66 ± 0.01 | -0.95 ± 0.09 | -2.05 ± 0.15 | 0.23 ± 0.08 | 1.33 ± 0.05 |
沙丘上部 Upperdune | 0.10 ± 0.02 | 117.33 ± 3.40 | 3.35 ± 0.40 | -0.82 ± 0.04 | -2.12 ± 0.04 | -0.91 ± 0.02 | 0.22 ± 0.15 | 0.73 ± 0.01 | -1.34 ± 0.08 | -2.73 ± 0.08 | 0.43 ± 0.07 | 1.82 ± 0.07 |
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