塞罕坝不同林龄华北落叶松人工林林下植物叶解剖特征及其氮添加响应

doi:10.11707/j.1001-7488.LYKX20230571

Abstract

Abstract:

Objective: Understory plants play a key role in maintaining the structure and function of plantation communities. Studying the changes in the anatomical structure of understory plants with nitrogen addition would help to understand the response and adaptation mechanism of understory plants to environmental changes. Method: In the present study, plant microtome technology was used to compare the leaf anatomical characteristics of dominant understory species and their plasticity in a chronosequence of Larix principis-rupprechtii plantation (juvenile forest, immature forest and near-mature forest) in Saihanba and their responses to nitrogen addition (0, 20, and 50 kg·hm^?2a^?1). The changes in the correlation between the anatomical characteristics of understory plants under different nitrogen treatments were examined. Result: 1) There was a certain regularity in the plasticity index of different leaf anatomical characteristics. The thickness of palisade tissue and lower epidermis was relatively stable, while the thickness of spongy tissue was more sensitive. 2) Nitrogen addition had no significant effect on 9 anatomical characteristics of understory plants (P>0.05), but significantly affected the correlations between the anatomical characteristics. Compared with low nitrogen addition, high nitrogen addition enhanced the relationship between leaf thickness related indexes, but weakened the relationship between vascular tissue related indexes. 3) The basic values of leaf anatomical characteristics of understory plants in the juvenile forest were significantly higher than those in the middle-aged forests and the near-mature forests, while there was no significant difference in the basic values between the middle-aged and near-mature forests. The leaf thickness related indexes of understory plants in young stands were promoted by nitrogen addition, while vascular tissue related indexes were inhibited. In contrast to the juvenile forest, leaf thickness related indexes in the near-mature forests were inhibited by nitrogen addition, while the vascular tissue related indexes were promoted. Leaf anatomical characteristics of understory plants in middle-aged stands had the highest response to nitrogen addition and most of them responded positively. Conclusion: This study suggests that the leaf thickness and vascular tissue of understory plants at different age plots may adopt different strategies to adapt to nitrogen fertilizer, which should be considered according to different situations when interpreting the response and adaptation mechanisms of plants.

Key words: leaf anatomical traits, nitrogen addition, Larix principis-rupprechtii, plantation, stand age, understory plants

CLC Number:

Q944.52

Xiaoyan Zhang,Xiaofeng Ni,Qiong Cai,Chengjun Ji. Leaf Anatomical Traits of Understory Plants and Their Response to Nitrogen Addition in a Chronosequence of Larix principis-rupprechtii Plantations in Saihanba, Hebei Province[J]. Scientia Silvae Sinicae, 2025, 61(1): 37-46.

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林龄Forest age	胸径 DBH/cm	树高 Height/m	林分密度 Stand density/(tree·hm^?2)	土壤碳氮比 Soil C: N	土壤pH Soil pH
15年幼龄林 15 years juvenile forest	4.7±0.1c	3.9±0.1c	2 640±157b	10.3±0.2b	6.2±0.2b
25年中龄林 25 years immature forest	11.9±0.2b	9.2±0.1b	3 060±132a	11.7±0.3a	6.5±0.0a
50年近熟林 50 years near-mature forest	21.0±0.3a	16.9±0.2a	870±48c	13.2±0.9a	6.3±0.2ab

物种 Species	科名 Family name	生活型 Life form	分布 Distribution
叉分蓼Polygonum divaricatum	蓼科Polygonaceae	草本Herbs	幼龄林 Juvenile forests
地榆Sanguisorba officinalis	蔷薇科Rosaceae	草本Herbs	幼龄林、中龄林、近熟林 Juvenile, immature and near-mature forests
风毛菊Saussurea japonica	菊科Compositae	草本Herbs	幼龄林 Juvenile forests
龙芽草Agrimonia pilosa	蔷薇科Rosaceae	草本Herbs	幼龄林、中龄林、近熟林 Juvenile, immature and near-mature forests
鸦葱Scorzonera austriaca	菊科Compositae	草本Herbs	幼龄林 Juvenile forests
老鹳草Geranium wilfordii	牻牛儿苗科Geraniaceae	草本Herbs	中龄林、近熟林 Immature and near-mature forests
珠芽蓼Polygonum viviparum	蓼科Polygonaceae	草本Herbs	中龄林 Immature forests
毛连菜Picris hieracioides	菊科Compositae	草本Herbs	中龄林、近熟林 Immature and near-mature forests
茶藨子Ribes nigrum	虎耳草科Saxifragaceae	灌木Shrubs	近熟林 Near-mature forests
山刺玫Rosa davurica	蔷薇科Rosaceae	灌木Shrubs	近熟林 Near-mature forests

F	LT	UET	LET	PMT	SMT	MT	VBD	VD	MVD
林龄Forest age	0.992	0.935	0.927	0.990	0.986	0.942	0.982	0.971	0.975
氮添加Nitrogen addition	0.121	0.046	0.092	0.071	0.140	0.062	0.911	0.804	0.252

F	LT	UET	LET	PMT	SMT	MT	VBD	VD
LT
UET	28.96^**
LET	7.41^**	99.41^**
PMT	328.32^**	29.47^**	10.47^**
SMT	3 173.75^**	39.07^**	15.67^**	18.02^**
MT	0.16	9.81^**	4.07^*	21.46^**	24.97^**
VBD	7.82^**	8.51^**	7.07^**	28.79^**	1.73	4.93^*
VD	3.16^*	0.68	2.22	1.50	9.28^**	39.57^**	1.36
MVD	2.93^*	1.55	3.26^*	6.86^**	3.48^*	1.93	15.29^**	2 253.11^**

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Leaf Anatomical Traits of Understory Plants and Their Response to Nitrogen Addition in a Chronosequence of Larix principis-rupprechtii Plantations in Saihanba, Hebei Province

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