林业科学 ›› 2023, Vol. 59 ›› Issue (6): 19-27.doi: 10.11707/j.1001-7488.LYKX20220483
蔡天润1,2,郭佳1,王紫怡1,宋亚欣1,张淑敏3,杨敏生1,张军1,*
收稿日期:
2022-07-16
接受日期:
2023-05-09
出版日期:
2023-06-25
发布日期:
2023-08-08
通讯作者:
张军
基金资助:
Tianrun Cai1,2,Jia Guo1,Ziyi Wang1,Yaxin Song1,Shumin Zhang3,Minsheng Yang1,Jun Zhang1,*
Received:
2022-07-16
Accepted:
2023-05-09
Online:
2023-06-25
Published:
2023-08-08
Contact:
Jun Zhang
摘要:
目的: 以河北省平泉市黄土梁子林场刺槐林为研究对象,验证已开发刺槐SSR引物的多态性,探究刺槐萌蘖分布格局,为人工促进刺槐林萌蘖更新提供理论依据。方法: 在河北省平泉市黄土梁子林场选取3块刺槐萌蘖现象明显的样地,利用9对SSR引物对125株刺槐进行亲缘关系鉴定,采用传统样地调查法和可变尺度的相邻格子法划分5个取样尺度(5 m×5 m、5 m×10 m、10 m×10 m、10 m×15 m、20 m×30 m),计算偏离指数(C)以及其t检验、Cassie指标(CA)、平均拥挤度(m*)、负二项指数(K)、Green指数(GI)和聚块性指标(PAI)6个格局判定参数,判断山地刺槐格局和规模。结果: 9对引物对样地内刺槐表现出良好多态性,平均多态信息含量为0.76。3块样地内,共有73个基因型,鉴定出76个克隆分株。刺槐萌蘖分布格局随取样尺度增大聚集格局逐渐减弱,尺度由小到大分布格局由集群分布到随机分布,在5 m×5 m尺度下具有最强聚集格局规模。结论: 基于SSR分子标记与生态学调查相结合,探索萌蘖扩散格局研究新方法,阐明山地刺槐萌蘖分布格局,对刺槐萌蘖更新理论有了进一步理解。无干扰状态下,刺槐林经历采伐后萌蘖分布格局为聚集分布。萌蘖植株在小范围聚集分布会造成基因型单一,不利于种群多样性,建议对距离过近影响正常生长发育的个体进行疏伐,缓解竞争关系,提高林分质量。
中图分类号:
蔡天润,郭佳,王紫怡,宋亚欣,张淑敏,杨敏生,张军. 基于SSR分子标记的山地刺槐克隆生长空间格局分析[J]. 林业科学, 2023, 59(6): 19-27.
Tianrun Cai,Jia Guo,Ziyi Wang,Yaxin Song,Shumin Zhang,Minsheng Yang,Jun Zhang. Spatial Pattern Analysis of Clonal Growth of Robinia pseudoacacia in Mountainous Areas Based on SSR Molecular Markers[J]. Scientia Silvae Sinicae, 2023, 59(6): 19-27.
表1
刺槐SSR引物基本信息"
引物 Primer | 正向引物序列 Forward primer sequence 5’→3’ | 反向引物序列 Reverse primer sequence 5’→3’ | 目的片段长度 Target fragment length/ bp | 解链温度 Melting temperature(Tm)/ ℃ |
Rp-01 | TGCAGAAAGAGAAAGCAGAGG | CCGAACCCTTTCTGGTTAGTC | 140 | 53 |
Rp-04 | CTCGTGATGATGGTGTTGATG | AATGGTCCAAACAACACGAAG | 146 | 55 |
Rp-05 | CCTTGCACATTTATCCCAGAA | CGACCTCGATCTTTTCTTGTG | 158 | 55 |
Rp-06 | TGGACAAAACATCATCGTGTG | CTCTCTTCTTTCTGCCCCTCA | 147 | 55 |
Rp-12 | AAGAGTCATCACGGAGACCAA | GGAGTCCAATTAAGTGCGAGA | 150 | 55 |
Rp-15 | TTAACTAATGCGGCGAGAAGA | GAGAGGAAGTGTGCGAAACAA | 119 | 49 |
Rp-28 | CTTGGTCTAGAAAGTCCTGCT | GGTCATCAAGGTTAGTTGGAT | 151 | 55 |
Rp-32 | CCACGTGGTTCTTCAAACATT | CAACAACAACCCACAAACACA | 163 | 53 |
Rp-37 | TGTCGTCATTTTATTTTACCC | CTCACCCTTTTTATTTCCATT | 152 | 55 |
表2
6个格局参数公式及判定标准"
指标 Index | 公式 Formula | 判定标准 Judgment criteria | ||
集群分布 Cluster distribution | 随机分布 Random distribution | 均匀分布 Uniform distribution | ||
偏离指数 Deviation index( C ) | t检验 t-test: 自由度 Degree of freedom: n?1, t>t0.05时达到显著水平 t>t0.05reaching a significant level | C>1 | C=1 | C<1 |
负二项指数 Negative binomial distribution parameters( K ) | | K>0 | K>8 | K<0 |
Cassie 指标 Cassie index(CA) | CA=1/K | CA>0 | CA=0 | CA<0 |
平均拥挤度 Mean crowding( m*) | | | | |
Green 指数 Green index(GI) | GI=(C?1)/(n?1) | GI>0 | GI=0 | GI<0 |
聚块性指标 Patchiness index(PAI) | PAI=1+1/K | PAI>1 | PAI=1 | PAI<1 |
表3
9对SSR引物对125株刺槐扩增情况统计"
引物 Primers | 等位基因数目 No. of alleles | 有效等位基因数目 No. of effective alleles | 香农指数 Shannon's index | 实际杂合度 Observed heterozygosity | 预期杂合度 Expected heterozygosity | 多态信息含量 Polymorphism information content | 基因辨别能力 Probability of discrimination |
RP-01 | 6 | 3.09 | 1.43 | 0.39 | 0.68 | 0.77 | 0.68 |
RP-04 | 7 | 6.26 | 1.89 | 0.49 | 0.84 | 0.90 | 0.84 |
RP-05 | 8 | 4.46 | 1.69 | 0.52 | 0.78 | 0.85 | 0.78 |
RP-06 | 9 | 4.71 | 1.72 | 0.38 | 0.79 | 0.88 | 0.79 |
RP-12 | 8 | 3.53 | 1.50 | 0.18 | 0.72 | 0.77 | 0.72 |
RP-15 | 4 | 2.15 | 1.02 | 0.30 | 0.53 | 0.60 | 0.53 |
RP-28 | 6 | 5.28 | 1.71 | 0.67 | 0.81 | 0.85 | 0.81 |
RP-32 | 6 | 2.26 | 1.00 | 0.07 | 0.56 | 0.56 | 0.56 |
RP-37 | 6 | 2.17 | 1.10 | 0.48 | 0.54 | 0.66 | 0.54 |
平均 | 5.89 | 4.19 | 1.52 | 0.33 | 0.74 | 0.76 | 0.74 |
表4
刺槐无性系鉴定结果"
样地 Plot | 刺槐总数 Number of trees | 有萌蘖刺槐数量 Number of cloned ramet genotypes | 萌蘖刺槐总数 Total number of clone ramets | 无萌蘖刺槐数量 Number of genotypes without clones | 基因型总数 Number of genotypes | 萌蘖刺槐占比 Proportion of cloned plants (%) |
S1 | 33 | 6 | 18 | 15 | 21 | 54.6 |
S2 | 54 | 12 | 34 | 20 | 32 | 63.0 |
S3 | 38 | 6 | 24 | 14 | 20 | 63.2 |
总计 Total | 125 | 24 | 76 | 49 | 73 | 60.8 |
均值 Average | 41.67 | 8 | 25.33 | 16.33 | 26.33 | 60.2 |
表5
萌蘖刺槐分布格局参数计算及判定"
格局参数 Pattern parameters | 取样尺度 Sampling scale/ | ||||
5 m×5 m | 5 m×10 m | 10 m×10 m | 10 m×15 m | 20 m×30 m | |
单元数量 Unit number | 83 | 41 | 19 | 13 | 3 |
偏离指数 Deviation index( C ) | 2.083 | 2.038 | 2.028 | 1.535 | 2.579 |
t | 6.935* | 4.643* | 3.083* | 1.311 | 1.579 |
t0.05 | 1.989 | 2.026 | 2.110 | 2.201 | 4.303 |
负二项指数 Negative binomial distribution parameters( K ) | 0.845 | 1.786 | 3.892 | 10.926 | 16.044 |
Cassie指标 Cassie index(CA) | 1.183 | 0.560 | 0.257 | 0.092 | 0.062 |
平均拥挤度 Mean crowding( m*) | 1.999 | 2.892 | 5.028 | 6.381 | 26.912 |
Green指数 Green index | 0.013 | 0.026 | 0.057 | 0.045 | 0.789 |
聚块性指标(GI) Patchiness index(PAI) | 2.183 | 1.560 | 1.257 | 1.092 | 1.062 |
分布类型 Distribution type | 集群分布 Cluster | 集群分布 Cluster | 集群分布 Cluster | 随机分布Random | 随机分布Random |
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