植物生态学报
植物生態學報
식물생태학보
ACTA PHYTOECOLOGICA SINICA
2010年
1期
23-28
,共6页
吴统贵%吴明%刘丽%萧江华
吳統貴%吳明%劉麗%蕭江華
오통귀%오명%류려%소강화
杭州湾滨海湿地%N、P化学计量学%季节变化
杭州灣濱海濕地%N、P化學計量學%季節變化
항주만빈해습지%N、P화학계량학%계절변화
Hangzhou Bay coastal wetlands%N and P stoichiometry%seasonal variations
动态平衡理论是生态化学计量学的理论基础,各种有机体是否存在一个固定的化学计量比是生态学研究的热点问题.该文研究了杭州湾滨海湿地3种优势物种海三棱蔗草(Scirpus mariqueter)、糙叶薹草(Carex scabrifolia)和芦苇(Phragmites australis)叶片N、P生态化学计量特征的季节变化.结果发现,3种植物叶片N含量范围分别是7.41-17.12、7.47-13.15和6.03-18.09 mg·g~(-1),平均值(±标准差)分别为(11.69±2.66)、(10.17±1.53)和(11.56±3.19)mg·g~(-1);叶片P范围分别是0.34-2.60、0.41-1.10和0.35-2.04 mg·g~(-1),平均值为(0.93±0.62)、(0.74±0.23)和(0.82±0.53)mg·g~(-1);N:P范围分别是7.19-30.63、11.58-16.81和8.62-21.86,平均值为16.83±8.31、14.53±3.91和16.49±5.51,可见不同植物其生态化学计量值范围存在一定差异,但经方差分析发现3种草本植物问生长季节内N、P元素含量差异并不显著(p＞0.05).各物种叶片N、P含量均表现出在生长初期显著大于其他生长季节(p＜0.05),生长旺季(6、7月)随着叶片生物量的持续增加,N、P含量逐渐降低并达到最小值,随后8-9月叶片不再生长而N、P含量逐渐回升,在10月叶片衰老时N、P含量再次下降;叶片N:P则在生长初期较小,在生长旺季先升高后降低,随后叶片成熟不再生长时又逐渐增加并趋于稳定.
動態平衡理論是生態化學計量學的理論基礎,各種有機體是否存在一箇固定的化學計量比是生態學研究的熱點問題.該文研究瞭杭州灣濱海濕地3種優勢物種海三稜蔗草(Scirpus mariqueter)、糙葉薹草(Carex scabrifolia)和蘆葦(Phragmites australis)葉片N、P生態化學計量特徵的季節變化.結果髮現,3種植物葉片N含量範圍分彆是7.41-17.12、7.47-13.15和6.03-18.09 mg·g~(-1),平均值(±標準差)分彆為(11.69±2.66)、(10.17±1.53)和(11.56±3.19)mg·g~(-1);葉片P範圍分彆是0.34-2.60、0.41-1.10和0.35-2.04 mg·g~(-1),平均值為(0.93±0.62)、(0.74±0.23)和(0.82±0.53)mg·g~(-1);N:P範圍分彆是7.19-30.63、11.58-16.81和8.62-21.86,平均值為16.83±8.31、14.53±3.91和16.49±5.51,可見不同植物其生態化學計量值範圍存在一定差異,但經方差分析髮現3種草本植物問生長季節內N、P元素含量差異併不顯著(p＞0.05).各物種葉片N、P含量均錶現齣在生長初期顯著大于其他生長季節(p＜0.05),生長旺季(6、7月)隨著葉片生物量的持續增加,N、P含量逐漸降低併達到最小值,隨後8-9月葉片不再生長而N、P含量逐漸迴升,在10月葉片衰老時N、P含量再次下降;葉片N:P則在生長初期較小,在生長旺季先升高後降低,隨後葉片成熟不再生長時又逐漸增加併趨于穩定.
동태평형이론시생태화학계량학적이론기출,각충유궤체시부존재일개고정적화학계량비시생태학연구적열점문제.해문연구료항주만빈해습지3충우세물충해삼릉자초(Scirpus mariqueter)、조협대초(Carex scabrifolia)화호위(Phragmites australis)협편N、P생태화학계량특정적계절변화.결과발현,3충식물협편N함량범위분별시7.41-17.12、7.47-13.15화6.03-18.09 mg·g~(-1),평균치(±표준차)분별위(11.69±2.66)、(10.17±1.53)화(11.56±3.19)mg·g~(-1);협편P범위분별시0.34-2.60、0.41-1.10화0.35-2.04 mg·g~(-1),평균치위(0.93±0.62)、(0.74±0.23)화(0.82±0.53)mg·g~(-1);N:P범위분별시7.19-30.63、11.58-16.81화8.62-21.86,평균치위16.83±8.31、14.53±3.91화16.49±5.51,가견불동식물기생태화학계량치범위존재일정차이,단경방차분석발현3충초본식물문생장계절내N、P원소함량차이병불현저(p＞0.05).각물충협편N、P함량균표현출재생장초기현저대우기타생장계절(p＜0.05),생장왕계(6、7월)수착협편생물량적지속증가,N、P함량축점강저병체도최소치,수후8-9월협편불재생장이N、P함량축점회승,재10월협편쇠로시N、P함량재차하강;협편N:P칙재생장초기교소,재생장왕계선승고후강저,수후협편성숙불재생장시우축점증가병추우은정.
Aims Homeostasis constrains the elemental composition of individual species within narrow bounds no matter the chemical composition of the environment or the resource base. Our objective was to determine the dynamics of leaf stoichiometry during the growth period of plants and the optimum time for stoichiometry study. Methods We monitored leaf N, P stoichiometry of Scirpus mariqueter, Carex scabrifolia and Phragmites aus-tralis, the dominant species in Hangzhou Bay coastal wetlands, at different growth stages from May to October 2007.Important findings Leaf N, P stoichiometry of the Scirpus, Carex and Phragmites species showed differences: 7.41-17.12, 7.47-13.15 and 6.03-18.09 mg-g~(-1) for N, 0.34-2.60, 0.41-1.10 and 0.35-2.04 mg·g~(-1) for P, and 7.19-30.63, 11.58-16.81 and 8.62-21.86 for N:P ratios, respectively. The arithmetic means for the three species were (11.69 ± 2.66), (10.17 ± 1.53) and (11.56 ± 3.19) mg·g~(-1) for N, (0.93 ± 0.62), (0.74 ± 0.23) and (0.82 ± 0.53) mg·g~(-1) for P, and 16.83 ± 8.31, 14.53 ± 3.91 and 16.49 ± 5.51 for N:P, respectively, but there was no significant difference of N, P stoichiometry (p ＞ 0.05). It showed high N, P concentrations at the early stage of growth because of small biomass and then decreased greatly with leaf expansion during the fast growth period, increased as leaf growth became stable and decreased again with leaf senescence. Leaf N:P was low at the early stage of growth and then increased, decreased strongly at the fast growth period, and became stable after leaf maturation.
