林业科学 ›› 2020, Vol. 56 ›› Issue (11): 21-30.doi: 10.11707/j.1001-7488.20201103
陈奕帆1,2,付晓莉1,*,王辉民1,2,戴晓琴1,寇亮1,陈伏生3,卜文圣3
收稿日期:
2019-09-28
出版日期:
2020-11-25
发布日期:
2020-12-30
通讯作者:
付晓莉
基金资助:
Yifan Chen1,2,Xiaoli Fu1,*,Huimin Wang1,2,Xiaoqin Dai1,Liang Kou1,Fusheng Chen3,Wensheng Bu3
Received:
2019-09-28
Online:
2020-11-25
Published:
2020-12-30
Contact:
Xiaoli Fu
摘要:
目的: 探讨不同径级中龄杉木生长速率对林下植被管理措施的响应机制,为中龄杉木的科学管理策略提供理论支撑。方法: 依托2013年建立的亚热带中龄杉木人工林林下植被管理实验平台中1998年种植的杉木林。试验处理为保留林下植被(CK)和清除林下植被(UR)。至2016年,12~14 cm和16~18 cm两径级杉木占CK处理总林木数的42.6%,占UR处理总林木数的77.1%。2016—2018年研究了这两径级中龄杉木的化学计量、资源获取及利用效率、碳分配模式(如结构vs非结构性碳(NSC)间的分配,NSC在不同器官间的分配)及相对生长速率(RGR)。结果: 清除林下植被对不同径级的中龄杉木RGR的影响不同。清除林下植被对12~14 cm径级中龄杉木RGR无显著影响,但会减缓16~18 cm径级中龄杉木的生长。清除林下植被对12~14 cm、16~18 cm两径级的中龄杉木最大净光合速率、水分利用效率、光合氮利用率、叶片全氮(N)、全磷(P)含量、N/P及叶片NSC(NSCleaf)、枝条NSC(NSCbranch)和树干NSC(NSCtrunk)均无显著影响。对于16~18 cm径级的中龄杉木而言,清除林下植被显著降低新叶NSC(尤其是可溶性糖,SS)含量,增大NSCtrunk/RGR和NSCleaf/RGR,使林木光合产物优先用于存储而非生长,进而减缓了林木的RGR。对于12~14 cm径级的中龄杉木而言,清除林下植被虽然显著增加新叶与老叶间SS的比值,但NSCleaf/RGR是影响该径级的中龄杉木RGR的主要因素,而清除林下植被对该径级NSCleaf/RGR无显著影响。结论: 林下植被去除对中龄杉木生长速率影响的径级依赖性主要受碳分配机制调控,而非受养分化学计量、资源获取及利用效率等机制影响。
中图分类号:
陈奕帆,付晓莉,王辉民,戴晓琴,寇亮,陈伏生,卜文圣. 林下植被清除对不同径级中龄杉木生长速率的影响机制[J]. 林业科学, 2020, 56(11): 21-30.
Yifan Chen,Xiaoli Fu,Huimin Wang,Xiaoqin Dai,Liang Kou,Fusheng Chen,Wensheng Bu. Effects of Understory Removal on Growth Rate of Middle-Aged Chinese Fir with Different DBH Classes[J]. Scientia Silvae Sinicae, 2020, 56(11): 21-30.
表1
径级和林下植被清除对中龄杉木光合参数的影响①"
最大净光合速率 Amax/(μmol·m-2s-1) | 水分利用效率 WUE/(μmol·mmol-1) | 光合氮素利用效率 PNUE/(μmol·g-1s-1) | |
12~14 cm径级-清除林下植被S-UR | 2.68±0.35a | 4.28±0.74a | 2.04±0.29a |
12~14 cm径级-保留林下植被S-CK | 2.21±0.59a | 2.52±0.61ab | 1.17±0.47a |
16~18 cm径级-清除林下植被B-UR | 2.97±0.45a | 2.95±0.59ab | 2.20±0.35a |
16~18 cm径级-保留林下植被B-CK | 1.89±0.48a | 1.63±0.81b | 1.26±0.35a |
径级DBH | P=0.970 | P=0.171 | P=0.683 |
林下植被管理Understory treatment | P=0.111 | P=0.060 | P=0.099 |
径级×林下植被管理DBH× Understory treatment | P=0.524 | P=0.779 | P=0.410 |
表2
径级和林下植被清除对中龄杉木叶片养分含量的影响"
全氮 TN/(mg·g-1) | 全磷 TP/(mg·g-1) | 氮磷比 N/P | |
12~14 cm径级-清除林下植被S-UR | 11.25±0.27ab | 0.87±0.02a | 13.03±0.31a |
12~14 cm径级-保留林下植被S-CK | 10.89±0.30b | 0.86±0.31a | 12.74±0.31a |
16~18 cm径级-清除林下植被B-UR | 11.63±0.42ab | 0.83±0.03a | 14.06±0.48a |
16~18 cm径级-保留林下植被B-CK | 12.20±0.68a | 0.87±0.04a | 13.93±0.49a |
径级DBH | P=0.048 | P=0.743 | P=0.013 |
林下植被管理Understory treatment | P=0.797 | P=0.597 | P=0.632 |
径级×林下植被管理DBH× Understory treatment | P=0.268 | P=0.411 | P=0.849 |
表3
径级和林下植被清除对中龄杉木叶、枝、干非结构性碳水化合物的影响"
叶非结构性碳水化合物 NSCleaf(%) | 枝条非结构性碳水化合物 NSCbranch(%) | 树干非结构性碳水化合物 NSCtrunk(%) | |
12~14 cm径级-清除林下植被S-UR | 4.73±0.17a | 4.13±0.24a | 0.35±0.03a |
12~14 cm径级-保留林下植被S-CK | 5.00±0.18a | 4.11±0.31a | 0.39±0.06a |
16~18 cm径级-清除林下植被B-UR | 4.78±0.16a | 3.89±0.19a | 0.37±0.03a |
16~18 cm径级-保留林下植被B-CK | 5.11±0.12a | 3.86±0.20a | 0.43±0.11a |
径级DBH | P=0.660 | P=0.354 | P=0.558 |
林下植被管理Understory treatment | P=0.103 | P=0.928 | P=0.355 |
径级×林下植被管理DBH×Understory treatment | P=0.890 | P=0.996 | P=0.835 |
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