CAJ | 학술논문

2008年5～11月,采用定位研究方法对黄河口滨岸潮滩不同生境下翅碱蓬(Suaeda salsa)氮的累积与分配特征进行了研究.结果表明,中潮滩翅碱蓬(JP1)和低潮滩翅碱蓬(JP2)不同器官生物量均具有明显季节变化特征,总体表现为JP1高于JP2,二者枯落物量均呈递增变化;JP1、JP2根、茎和枯落物的全氮(TN)含量在生长季均呈递减变化,符合指数衰减模型,而叶的总氮(TN)含量波动变化明显;二者不同器官及枯落物的氮累积量和累积速率(V_N)季节变化明显,JP1地上部分的氮累积量和V_N一般明显高于JP2,且二者地上部分氮累积量和V_N均明显高于地下;JP1、JP2不同部分的氮分配比差异明显,其中叶的分配比最高,分别为(46.91±16.97)%和(55.21±9.79)%,说明叶是翅碱蓬重要的氮累积器官;二者氮的年吸收量和最大现存量分别为5.29 g/m~2、2.63 g/m~2和13.76 g/m~2、3.19 g/m~2;二者氮的吸收系数(0.014 5和0.006 5)均较低,而利用系数表现为JP2(0.824 3)>JP1(0.384 4),JP1在氮的吸收方面要强于JP2, 而在利用方面却低于JP2.JP1和JP2生物量、TN含量、累积量、累积速率、分配比以及吸收与利用状况的差异主要与其生态学特性和所处生境的水盐状况有关.
2008년5～11월,채용정위연구방법대황하구빈안조탄불동생경하시감봉(Suaeda salsa)담적루적여분배특정진행료연구.결과표명,중조탄시감봉(JP1)화저조탄시감봉(JP2)불동기관생물량균구유명현계절변화특정,총체표현위JP1고우JP2,이자고락물량균정체증변화;JP1、JP2근、경화고락물적전담(TN)함량재생장계균정체감변화,부합지수쇠감모형,이협적총담(TN)함량파동변화명현;이자불동기관급고락물적담루적량화루적속솔(V_N)계절변화명현,JP1지상부분적담루적량화V_N일반명현고우JP2,차이자지상부분담루적량화V_N균명현고우지하;JP1、JP2불동부분적담분배비차이명현,기중협적분배비최고,분별위(46.91±16.97)%화(55.21±9.79)%,설명협시시감봉중요적담루적기관;이자담적년흡수량화최대현존량분별위5.29 g/m~2、2.63 g/m~2화13.76 g/m~2、3.19 g/m~2;이자담적흡수계수(0.014 5화0.006 5)균교저,이이용계수표현위JP2(0.824 3)>JP1(0.384 4),JP1재담적흡수방면요강우JP2, 이재이용방면각저우JP2.JP1화JP2생물량、TN함량、루적량、루적속솔、분배비이급흡수여이용상황적차이주요여기생태학특성화소처생경적수염상황유관.
From May to November in 2008, positioning research method was used to study the characteristics of nitrogen (N) accumulation and allocation of Suaeda salsa in different growth conditions of intertidal zone in Yellow River estuary. Results showed that the biomass of different organs of S.salsa in middle tidal flat(JP1) and S.salsa in low tidal flat(JP2)showed significantly seasonal dynamics, and the values of JP1 were much higher than those of JP2. The litter amounts of JP1 and JP2, in whole, increased during growth season. The total nitrogen (TN) contents in root, stem and litter of JP1 and JP2 decreased during growth season, which could be described by exponential decay model, while the values in leaf fluctuated greatly. The N accumulation amounts and rates of different organs and litters had significantly seasonal changes, and the values of aboveground organs of JP1 were much higher than those of JP2. In addition, the N accumulation amounts and rates in aboveground part were much higher than those in belowground part. The N allocation ratios of different parts in JP1 and JP2 also had significant differences. Leaf was the important N storage, and the N allocation ratios of JP1 and JP2 were (46.91±16.97)% and (55.21±9.79)%, respectively. The annual N absorption amount and maximum standing crop of JP1 and JP2 were 5.29 g/m~2, 2.63 g/m~2 and 13.76 g/m~2, 3.19 g/m~2, respectively. The N absorption coefficients (0.471 6 and 0.204 6) of JP1 and JP2 were much lower, while the utilization coefficient of JP2 (0.824 3) was much higher than that of JP1 (0.384 4), which indicated that JP1 had higher N absorption capability than JP2, but the N utilization capacity was just advers. Further studies showed that the differences of biomass, TN content, N accumulation amount and rate, N allocation ratio, N absorption and utilization status between JP1 and JP2 mainly correlated with their ecological characteristics and the water and salinity conditions in their habitat.