Human activities led to many continuous natural forests fragmented into such as

Fengshui

forests around villages

how their forest carbon sinks are related to forests patch sizes and vegetation biomasses demands academic research. In a case study of a

Fengshui

forest in eastern Guangzhou suburbs

five large patches for each of three patches with area sizes of 15-25 hm

2

5-8 hm

2

and 0.5-2 hm

2

respectively

were selected based on site conditions

vegetation type

forest structure

stand age and growth stage. Then

the above-ground biomass and gradient variation from the edge to center for the

Fengshui

forest were investigated to figure out the relationship between patch size and above-ground biomass by using combined quadrat survey and remote sensing estimation. The results are as follows: (1) the average above-ground biomass obviously varies from large to small patches (

P

<

0.01)

and generally shows an increase trend with the forest size with a biomass of 199.33 t/hm

2

for large patches

 181.59 t/hm

2

for medium

and 147.51 t/hm

2

for small patches. (2) In large patches

the above-ground biomass increases from 290.24 t/hm

2

226.63 t/hm

2

to 129.16 t/hm

2

from center to edge

showing that the edge effect has a great impact on ground biomass in the

Fengshui

forest patches. (3) There is the largest proportion of tall and thick trees in large patches

which probably results in a larger biomass in large patches than in medium and small patches. So the improvement of forest carbon sink needs the protection and construction of large forest patches.