Study on Seed Rain and Surface Seed Bank of Betula platyphylla in Different Ages in the Southern Daxing'anling Mountains

doi:10.13466/j.cnki.lyzygl.2019.04.011

Abstract

Abstract:

In the Inner Mongolia Saihanwula National Nature Reserve,the regeneration status of different birch forests is different,with S1(10~15a),S2(20~30a) and S3(40~45a) were the research objects.The differences of provenances and surface seed bank of three different forest ages were analyzed and compared,and the limiting factors of natural regeneration of birch forest were explored.The results showed that:(1) The seed height,litter litterand seed rain 1000-grain weight of different plant ages were consistent with the dynamic height of different distribution periods,and the overall performance was S1>S2>S3;(2)The total number of seed rain in white birch forest is S1(90.48±0.08) grain>S2(88.18±0.09) grain>S3(68.74±0.07) grain;(3)The total seed quantity of white birch forest of different forest age is S1(35273.00±2929.00) grain>S2(32079.00±1770.00) grain>S3(8478.00±432.00) grain,the highest proportion of intact seeds of S1 forest age B.bicolor;(4)The total seed bank of three different ages of white birch population is S1(9882.00/m ²)>S2(8859.00/m ²) >S3(2539.00 granules/m ²),the germination rate of indoor germination experiment of Betula chinensis seed bank was S1(44.30%)>S2(40.10%)>S3(21.20%).It is indicated that the provenance is not the main limiting factor for the natural regeneration of birch forest in Saihanwula region.The forest age is the main factor leading to the uneven renewal of birch forest in Saihanwula.

Key words: White birch, forestage, seedrain, surface seed bank, regeneration

CLC Number:

S718.5

FENG Qianqian, ZHOU Mei, ZHAO Pengwu, WU Yiheng. Study on Seed Rain and Surface Seed Bank of Betula platyphylla in Different Ages in the Southern Daxing'anling Mountains[J]. FOREST RESOURCES WANAGEMENT, 2019, (4): 74-79.

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林龄	平均树高 /m	平均胸径 /cm	郁闭度	枯落物厚度 /cm	白桦更新
S1	8.40	9.30	0.60	4.80±0.28	实生(多)、萌生
S2	12.10	12.60	0.80	5.80±0.40	实生、萌生(多)
S3	14.00	17.50	0.70	7.00±0.30	无

林龄	初期	高峰期	末期	均值
S1	82.83±8.59a	100.00±0.00a	88.62±11.79a	90.48±0.08b
S2	82.19±7.75a	97.84±3.29a	84.50±10.22a	88.18±0.09c
S3	54.02±21.38b	90.95±5.82b	61.27±32.63a	68.74±0.07a

林龄	初期	高峰期	末期	均值
S1	0.26±0.05b	0.39±0.06b	0.33±0.04b	0.28±0.08a
S2	0.14±0.05a	0.25±0.01a	0.17±0.01a	0.19±0.07a
S3	0.13±0.01a	0.22±0.03a	0.15±0.02a	0.17±0.09b

林龄	种子雨总量	完整种子
S1	35273.00±2929.00b	31931.00±2609.00b
S2	32079.00±1770.00a	28679.00±1582.00a
S3	8478.00±432.00a	5087.00±681.00a

林龄	种子库总量	种子库发芽率	备注
S1	9882.00±82.00a	44.30%±5.60%a	未选种
S2	8859.00±77.00a	40.10%±4.50%a	未选种
S3	2539.00±64.00b	21.20%±3.80%b	未选种